Sailthru aims to increase user engagement and conversion through smart data which marketers can use to better understand and respond to users in real time. This results in a personalized user experience in the form of targeted emails, for example, or a homepage tailored to an individual’s interests. Sailthru's clients include Business Insider, AOL . Huffington Post and Newsweek among others. The startup recently raised $19 million. 

Number of search engine referrals per month. You can track which search engines are sending the most people to your site. You can also track the keywords that users are typing into search engines that lead them to your site. This will help you determine what keywords you need to use to optimize your site and which keywords you should sponsor to promote your business.
In today’s knowledge economy, the marketing landscape for businesses has changed dramatically. Companies that hope to effectively spread the word about their offerings, attract customers, engage with them and ultimately retain them, need to adapt to these changes. Those that fail to do so will fall behind. Below are 15 great marketing softwares that can help companies remain relevant and master marketing in the digital age:
Marketo is one of the biggest and most established marketing automation companies, which makes it easy to launch and manage marketing campaigns. Marketo offers everything marketers need including tools for automating inbound marketing, lead management, social media marketing, sales management dashboards as well as analytics. In 2012, the company generated revenue to the value of $58.4 million and was recently registered on NASDAQ.
We offer online financial help to those in need of funds for the following reasons, pay bills, starting of various business, personal funding building of home and other financial needs. Apply here it’s very easy, just email us and your financial problem is solve withing a short period of time with affordable interest rate of 3% contact us now fast and durable funds raising for all email us now
If your needs are more pedestrian, try a simpler solution. Direct Response, for instance, performs simple conversion tracking and is much more affordable. There’s also an open source Web analytics tool called AWStats that tracks traffic, referrers, and other data. If you use Google or Overture to target users by sponsoring keywords, you can measure sales with their free conversion-based tracking tools.
Traffic is the measure of people visiting your website or sales page. If no one sees what you’re offering, you won’t get any customers. Like a retail store in a busy mall or in the downtown core of a big city, you want lots of people passing by your store. Your website is your store. You want high traffic (lots of people visiting your website), you want consistent traffic (consistency helps with forecasting revenue), and you want targeted traffic (visitors who are in your target market).
We love Aiva Labs because their AI platform makes our lives easier by helping streamline the conversion optimization process. Their campaign builder allows us to target, test and optimize specific on-site content based on user behavior. We can essentially retarget and customize the experience over different devices at little cost to our smaller business clients.
Prezi provides presentation software, which utilizes zoom, motion and spatial relationships to help individuals make inspiring presentations. In 2012, Prezi unveiled a host of creative presentation effects, including 3D and fading animations tools, designed to help professionals make even more stimulating and exciting presentations, through increased visual appeal.

Don’t read everything at once. There is a lot of great information in here, but it’s easy to feel overwhelmed after reading through all of the content in one sitting. Instead, take incremental steps. For example, if you want to find out where or how to ask people for their emails on your site, read the content in chapter 2. Implement it, then come back later for the next steps.
Hi Kal, thanks for your comment. I am not sure what happened to those people whom you mentioned in the comment. Are they alright? I guess, as the writer I am at liberty to include marketers whom I like or have interacted with. For this post I have included only those marketers with whom I have some level of interaction. Harsh for example wanted to hire me for his blog. I have known Matthew Woodward since the time he started his award winning blog and so on.People like Frank Kern are so busy that they won’t even notice if I have written about them and they don’t actively blog too, I guess.
This is a fantastic list. I’ve used several of these and as of now Moz is probably my favorite go-to site for the grand majority of things that I need. When it comes to programmatic digital media I tend to gravitate towards the Centro Blog though just because it is good to have that very detailed information. This is a good starter article by them if you want to get yourself familiar with their blog info. https://www.centro.net/blog/digital-media-operations-controlled

If you use (or plan to use) social media channels to connect with customers, consider applications that monitor social media conversations, track the results of social media marketing activities and allow you to measure the results of these campaigns. While social media marketing functionality is sometimes included in marketing automation platforms, many vendors also offer this as a best-of-breed solution.
I’ve tested the Welcome Mat and Smart Bar apps as well but they didn’t produce anywhere near the conversion rate of the List Builder and Scrollbox apps (note: that doesn’t mean you shouldn’t test them on your site… it’s just that they didn’t perform that well on our site with the setup we used so we removed them so not to distract the visitor too much while we figure out new ways to test them).
Why It Is Important: “With the complex workings of an agency, we couldn’t live without setting up complex task logic (repeating tasks automatically, assigning multiple people to complete a task, task dependencies), creating milestones for important dates and time tracking for accurate client billing. In addition to the typical project management features like being able to see which tasks are ahead / behind, keeping all of project messages in one place and organizing all our important documents, Teamwork helps us manage how we’re using other tools and how we’re managing our time for peak performance!”
But if you are not professional in this field, or short of time I suggest you use online platforms for creating your videos, as they’re safer, easy to use and also much more beneficial. One of them you can try is RenderForest. It’s an online video production tool, that has both free and paid versions. You can create either your own videos with the help of various templates or order a completely new video. Below are some template examples:
Hello friend,Celebrate this year 2018 with this Life Time transforming card .I have being hearing about this blank ATM card for a while and i never really paid any interest to it because of my doubts. Until now i discovered this hacker called Mr Edward. he is really good at what he is doing and he is God sent, Back to the point, I inquired about The Blank ATM Card from him If it works or even Exist he told me Yes and that its a card programmed for random money withdraws without being noticed and can also be used for free online purchases of any kind. This was shocking and i still had my doubts. Then i gave it a try and asked for the card and agreed to him terms and conditions. praying and hoping it was not a scam i used the blank CARD and it was successful i withdraw nothing less than 5,000 dollar daily the blank CARD worked like a magic and now i have am rich and famous in my society, i’m grateful to Carly because she changed my story all of a sudden,The card works perfectly fine in all country. Mr Edward email: [email protected] and you can call/whatsapp +16189997491 

Setting your goals should rely on the knowledge you glean from reviewing your metrics. Study your Google and social analytics to help you determine the attainable and realistic aspects of your goals. For example, getting “more” likes for your product’s Facebook page is desirable, but it’s not a particularly SMART goal. Getting 100 new Facebook likes within three months, however, is much SMARTer.
You hereby indemnify Us and undertake to keep Us indemnified against any losses, damages, costs, liabilities and expenses (including, without limitation, legal expenses and any amounts paid by Us to a third party in settlement of a claim or dispute on the advice of Our legal advisers) incurred or suffered by Us arising out of any breach by You of any provision of these terms of use.
I think what Brian and the testers are missing is that 15k is neither big enough to be impressive nor small enough to be inviting. It’s not a number that works effectively as social proof, and while I can’t test it out myself, I believe, based on evidence for social proof around the web, that DIYthemes would have had much better success with a combined number in the 50k+ range as mentioned above.

He is the co-founder of Neil Patel Digital. The Wall Street Journal calls him a top influencer on the web, Forbes says he is one of the top 10 marketers, and Entrepreneur Magazine says he created one of the 100 most brilliant companies. Neil is a New York Times bestselling author and was recognized as a top 100 entrepreneur under the age of 30 by President Obama and a top 100 entrepreneur under the age of 35 by the United Nations.
So, we surveyed digital agencies to discover the tools that have revolutionized some part of their business. Most of the respondents were members of the Databox Partner Program, a community of 90+ agencies that track marketing and sales data in real-time so they can run more successful campaigns for clients. So, we already knew they were technically-savvy!
Prezi provides presentation software, which utilizes zoom, motion and spatial relationships to help individuals make inspiring presentations. In 2012, Prezi unveiled a host of creative presentation effects, including 3D and fading animations tools, designed to help professionals make even more stimulating and exciting presentations, through increased visual appeal.
By sending out highly targeted and personalized campaigns, you will be better able to engage your members or prospective members. We know that the more relevant the piece of communication is to the recipient, their engagement with your association will increase. By working with GRC Direct, you will be able to effectively target and track your direct mail communications so you know what’s working and what isn’t working. You will be able to communicate on a whole different level that will let your members know you are listening to what they are saying.
Pawan, this is a great list. Some tools I know, some I’m trying out (like Drupal) and others I have yet to try. I will humbly add proofhub to this list in a Content Collaboration Tools category…another platform that is great to work collaboratively and efficiently. It allow us to receive real-time messages, assign tasks, start discussions, file sharing and more.

If what you had in mind is an animated video, Sellamations will prove to be the right choice. You can create doodle animations that are fun, engaging and can communicate your message in a clear manner. All doodles in this tool are custom hand drawn. You can ask for a custom character to be created specifically for your video too. You'll also benefit from professional voice-overs and help in script-writing.
Reda is the founder and CEO of Cloudswave. He works on the general strategy of the company and oversees marketing and sales. He develops the strategic plan to advance the company's mission and objectives and works to promote revenue, profitability and growth. Some of Reda's favorite hobbies include boxing and cooking. Follow Reda on Twitter and LinkedIn, or email him at [email protected].

In most cases digital marketing is instant. You can create an ad for Google, give it a budget and start running it relatively quick if you’re a pro. With some forms of digital marketing like SEO it does take time, but it is well worth the wait when you see your business page ranking number one in Google search. To potential customers, that first result is trustworthy. It must be good if it’s ranking number one right?

Big data enables companies to better target the core needs of customers by developing rich and informative content. Let’s understand how it helps companies collect data about customer behaviors. One example is cookie files. They collect information about customers’ activities as they browse the internet, generating personalized data in the process.


Creating definable, executable goals, achievable one to-do-list item at a time, not only chips away at the larger project, but also provides the continuity and momentum essential to achieving long-term goals. As grand as anyone’s ambitions may be, they can only be realized one day–one task–at a time. The notion of defining goals and action items and writing them down (which increases our accountability to ourselves for executing those items), then following through in eay-to-digest 15 minute increments, is the perfect recipe for sustainable progress toward any goal.

Pop-up forms provide visitors with a quick, convenient way to share contact information and subscribe to your list while they’re browsing your site, making them a powerful tool for audience growth. They’re easy to add to your site, and they’re proven to work—our research shows that Mailchimp users have seen their list growth rate increase by an average of 50.8% after adding a pop-up form to their site.
Picovico is an online tool that automatically creates slideshow videos from your photos and video clips in minutes. With exciting features such as voice-over, video clips, and pre-defined video templates, it empowers you to create beautiful slideshow video in a few simple steps. The videos you create can be downloaded and/or exported to your social media profiles. Picovico offers videos for personal and professional use, and API option for bulk videos.
أفضل شركة تنظيف منازل بالطائف ويتم الحفاظ على نظافة الأرضيات والمحافظة عليها من التشقق وذلك باستخدام فوط خاصة للأرضيات كما يتم وضع طبقة رقيقة من المواد الكميائية التى يتم من خلالها اعطاء بريق ولمعان متميز ويتم تنظيف الباركيه دون استخدام مياه تماما واننا تخصصون بجلي وتلميع الرخام ومعالجته بأحدث الطرق وجلي البلاط بجميع انواعه وبلورة البورسلان والسيراميك للمعه دائمه و تلميع جلى البلاط بجميع انواعه و بجوده في العمل ودقه بالمواعيد وبأسعارمنخفضة .
Why It Is Important: “We are a HubSpot Diamond Partner so we kind of live by HubSpot. Aside from that, it is hands down the most valuable tool we use. It stores pretty much every piece of data from our marketing and sales teams and provides insights on the most essential metrics alongside the tools needed to improve them. The most important thing HubSpot does for New Breed is host our website. Our website on the HubSpot COS allows us to generate highly qualified traffic and host our most important content. It’s our most valuable asset without a doubt.”

There are many popular marketing solutions on the market, and it can be hard to know what distinguishes one product from another and which is right for you. To help you better understand how the top marketing systems stack up against one another, we created a series of side-by-side product comparison pages that break down the details of what each solution offers in terms of pricing, applications, ease of use, support and more:


Awesome list, Pawan. I have used a good number of them, especially Outbrain, superb tool. I would like to offer one myself, Tweet Rocket. It’s a great tool for any business (or individual) who needs growth of relevant followers over a short period of time. A great tool that we use for many clients, and the results are fantastic! https://thetweetrocket.com


It’s not as clear cut as it seems. There are many content marketing tools that fall into multiple categories, but I have placed them in the category that best represents them. For example, Marketing AI measures analytics for your content, then helps you better optimize your content. In this case, should Marketing AI fall into the Analytics or Optimization tools group? In this case, I placed them in the Analytics group. However, Parse.ly is a relatively similar tool I decided to place into the Optimization category.
Picovico is an online tool that automatically creates slideshow videos from your photos and video clips in minutes. With exciting features such as voice-over, video clips, and pre-defined video templates, it empowers you to create beautiful slideshow video in a few simple steps. The videos you create can be downloaded and/or exported to your social media profiles. Picovico offers videos for personal and professional use, and API option for bulk videos.
Or, you can even create a character that looks just like you, or anyone else from the office; browse through different hairstyles, clothing, eye shapes and so on until you create your own animated twin. Another cool feature from GoAnimate is that you can add voice to your character by recording it directly or importing the file, and they will automatically start lip-syncing it.

Bitly is a free link shortening and tracking tool, which monitors traffic and referrals via custom links and displays detailed analytics about clicks, location, referring websites, activity over time and more. It’s widely used by publishers and businesses alike, and has a handy tagging system you can use to keep track of links from different marketing campaigns or portals.
Search engines continue to place increasing importance on content in their ranking of web pages, and visitors are becoming more and more discriminating about where they spend their time and money online. In addition, each unique element of content serves to increase one or more of the above online marketing objectives. Equally important for an active and profitable website is content promotion.
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If you decided that you want to buy 2,512,596 visitors, it would cost you $125,629.80 if you paid 5 cents a visitor. If you bought 41,142 links from a service like Sponsored Reviews at a rate of $20 a link, you would have spent $822,840. And that wouldn’t even give you high quality links. We naturally got our links from sites like Huffington Post and Forbes.”
Pretty comprehensive list. What about adding one more intuitive collaboration tool – Comindware Project (http://www.comindware.com/solutions/software-for-project-manager/ ). This nice solution with drag’n’drop interface, automatic saving, document version control and predictive Gantt-chart takes the chaos out of team collaboration and helps teams get clarity on their everyday projects, tasks, documents, discussions and deadlines.
Great article! Thank you for sharing these points as they have helped me understand your blog better. Your writing skills make things extremely clear, while I was reading the article I felt as if someone was teaching me, everything is explained very well. Kindly share more write-ups as these help us a lot and such articles add on to our knowledge. Thank you!
Wow, this is the most comprehensive list of tools i’ve come across. Thanks for pulling it together! One more category you may want to consider is something like “agency sourcing tools.” There are a number of platforms out there, including http://www.AgencyLoft.com, which are designed to help marketers find and connect with marketing agencies. Just a thought. Thanks! Oh, and I just bookmarked this page! 

The business card will never die so make sure you invest in a great one and hand it out wherever you go. Print ads (newsletters, newspapers, magazine, flyers, brochures) may not be as popular in this digital age so when you do use them make them impactive by adding coupons and events your hosting with free products and/or services. Billboards are still a great tool for marketing as well. T.V.commercials and radio spots with catchy jingles, memorable characters and slogans can go along way.
Pawan Deshpande is the founder and CEO of Curata, a Boston-based company offering content marketing software used by thousands of marketers around the world. He spearheaded the first-ever panel at SxSW on Content Marketing in 2011, and was a 2014 Finalist for MarketingProfs B2B Marketer of the Year. Pawan was an engineer at Microsoft and Google where he was awarded patents in social networking and machine learning. He previously attended MIT where his graduate thesis won top departmental and international awards.
Online marketing is usually a long-term endeavor. For this reason, it’s critical that you maintain your focus over the long haul. This means setting attainable goals -- both short and long-term -- and not being swayed or distracted by irrelevant trends or fads. It means staying on task and seeing your plans through to completion, even when those around you may be trying new strategies and shifting course. While it’s certainly important to remain flexible and adaptive, changing your focus frequently can significantly eat into your productivity and leave you in a constant state of flux.
More than ever before, people buy from people they know and trust. Being trustworthy -- and able to convey this trait to others -- is critical to being a successful online marketer. Garish, over-the-top landing pages; blatant self-promotion on social media; and spammy, keyword-laden copy will inevitably damage or destroy your online reputation. Being authentic and trustworthy is what will set you apart, helping you build long-term relationships with your customers and clients. 

The offer’s landing page needs to be very concise. Be clear about what the offer is, why it’s valuable, why they ought to take advantage of it now, and include a short form with their contact info so you can start tracking them as a lead. Once that’s done, you can begin communicating with them by email to usher them along to the next stage of their decision-making process.
Once people have shown an interest in you on the web, on social media or in person, how do you keep the conversation going? Make sure you are getting their information so you can contact them directly. Another report this year from Adobe found that email is still far and away the preferred channel for communication from businesses, even for millennials.
Online marketing requires a willingness to put in hard work now, even though you may not see the results for months (or even years) to come. There are no quick fixes when it comes to online marketing, so you must be prepared to continually work toward your goal without losing steam. A lack of short-term results may be disheartening, but if you’re patient, the results will be well worth the wait.
If you are a small to medium sized business you need to take advantage of everything digital marketing has to offer. Beating out large competitors is difficult enough. Don’t make it harder on yourself by using outdated marketing methods. There are countless reasons why digital marketing always wins versus traditional marketing. Digital or online marketing allows you to engage with your fans, keep your costs down and builds trust with your customers.
Pawan, this is a great list. Some tools I know, some I’m trying out (like Drupal) and others I have yet to try. I will humbly add proofhub to this list in a Content Collaboration Tools category…another platform that is great to work collaboratively and efficiently. It allow us to receive real-time messages, assign tasks, start discussions, file sharing and more.
First we have our exit intent pop-up, also known as a hover pop-up, which we use to help with our bounce rate. They appear almost exactly a minute after you come onto our site, which studies have shown to be the optimum time for conversion. While these can be annoying, the key to this style of pop-up is to use a lead magnet that offers an unbelievable amount of value. That’s why we offer people the option to sign up to our masterclasses.
One of a small business’s best marketing assets is a healthy email list. While proper management and use of your email file will drive revenue immensely, it is often a challenge to create the email list itself. With inbox clutter on the rise and customers becoming more sensitive toward any unwanted communication, marketers should develop their subscriber lists with relevance and care. 

Your MyThemeShop individual/package product(s) information will be emailed to the email address (that you will provide) once we receive your payment or after completing the registration. Even though this usually takes a few minutes, it may also take up to 24 hours. You can contact us through our contact page if you do not receive your email after waiting for this time period. You will have access to purchased product/bundle and the support forum after logging in with the given credentials.​


I broke this post into two sections so that I could walk you through the entire list building process. Part one will focus on the technical aspects of creating a path that helps your blog’s visitors become subscribers. And part two will focus on engaging those subscribers with effective email campaigns. All in all, by the end of this post, you’ll have everything you’ll need to build a massive email list. Let’s get started!

Probably the biggest reason why digital marketing has overtaken traditional marketing is that you as a business have the ability to track your customers every move online. This provides you with a wealth of data to analyze so that you can make adjustments in your digital marketing campaigns. With other forms of traditional marketing like radio or TV there is no way of knowing who saw your ad and who converted because of it.
In the online world, what you think is important isn’t always important. You have to remember that the lab rat — or customer — is always right. If customers have a choice of yellow and blue and tend to pick yellow, then yellow is the way to go. Immediate feedback can help drive the direction of your online marketing campaign. Try, test, and measure to determine what works and what doesn’t.
Traffic is the measure of people visiting your website or sales page. If no one sees what you’re offering, you won’t get any customers. Like a retail store in a busy mall or in the downtown core of a big city, you want lots of people passing by your store. Your website is your store. You want high traffic (lots of people visiting your website), you want consistent traffic (consistency helps with forecasting revenue), and you want targeted traffic (visitors who are in your target market).
أفضل شركة تنظيف منازل بالطائف ويتم الحفاظ على نظافة الأرضيات والمحافظة عليها من التشقق وذلك باستخدام فوط خاصة للأرضيات كما يتم وضع طبقة رقيقة من المواد الكميائية التى يتم من خلالها اعطاء بريق ولمعان متميز ويتم تنظيف الباركيه دون استخدام مياه تماما واننا تخصصون بجلي وتلميع الرخام ومعالجته بأحدث الطرق وجلي البلاط بجميع انواعه وبلورة البورسلان والسيراميك للمعه دائمه و تلميع جلى البلاط بجميع انواعه و بجوده في العمل ودقه بالمواعيد وبأسعارمنخفضة .
Hello friend,Celebrate this year 2018 with this Life Time transforming card .I have being hearing about this blank ATM card for a while and i never really paid any interest to it because of my doubts. Until now i discovered this hacker called Mr Edward. he is really good at what he is doing and he is God sent, Back to the point, I inquired about The Blank ATM Card from him If it works or even Exist he told me Yes and that its a card programmed for random money withdraws without being noticed and can also be used for free online purchases of any kind. This was shocking and i still had my doubts. Then i gave it a try and asked for the card and agreed to him terms and conditions. praying and hoping it was not a scam i used the blank CARD and it was successful i withdraw nothing less than 5,000 dollar daily the blank CARD worked like a magic and now i have am rich and famous in my society, i’m grateful to Carly because she changed my story all of a sudden,The card works perfectly fine in all country. Mr Edward email: [email protected] and you can call/whatsapp +16189997491
There’s an old saying that when the only tool you have is a hammer, every problem tends to look like a nail. Fight that kind of thinking as much as you can. Your plan may call for expertise you don’t have, or actions you aren’t very good at. So make some room in your plan to partner with someone else. If you’re great at connecting with customers but lousy at technology, find a partner whose strengths and weaknesses perfectly complement yours. Believe me, that person is out there and wants desperately to work with you.
Hi Pawan, what a fantastic compilation! I know what i’ll be doing this week – checking out the items on your list! Thanks so much for sharing. My I suggest an add to your list – CrossCap Marketing Calendar Software – omni-channel marketing calendar that allows marketing stakeholders to collaborate and outline strategy, execute initiatives, and track performance in a single system. Feel free to check it out: https://www.crosscap.com/marketing-calendar
If you want to start small with a pretty basic email marketing software that will give you some room to grow, this could be a good fit for you. Campaign Monitor offers a free trial and then a basic service that costs as little as $9 a month for the ability to send 2,500 emails to 500 different recipients. Once you reach the level where you'll need the Premier Plan it starts to get more expensive, though. You'll be able to send unlimited emails to 50,000 recipients for a monthly charge of nearly $1,000. For more recipients than that, you'll have to get a custom quote.
I got my already programmed and blank ATM card to withdraw the maximum of $2 000 00 daily for a maximum of 30 days. I am so happy about this because i got mine last week and I have used it to get $60 000 00. MR OMON is giving out the card just to help the poor and needy though it is illegal but it is something nice and she is not like other scam pretending to have the ATM cards. And no one gets caught when using the card. Get yours from her. By send her an email on: [email protected]
تتميز شركتنا نقل اثاث بالجبيل بتحدید متطلبات العملاء و الخدمات المطلوبة و اي خدمات اضافیة اخرى مع توفیرھا بجودة عالیة . سرعة الاستجابة والتواصل فى عملیة نقل الاثاث والعفش دون اى تاخیر او تسویف . فنیین فى جمیع التخصصات متمیزین ومھندسین ذو خبرة عالیة حقا و معدات حدیثھ في فك و تركیب العفش . الاف العربات الممیزة التي نستعملھا في تلبیة حاجة العملاء ادارة مرنة وقویة ومحكمة وایضا متفاھمة جدا فى التعامل مع العملاء الكرام وقادرة علي تلبیة طلبات عملائھا .	ارخص شركة نقل اثاث بالدمام 

I would agree with that statement and here’s why you should too. According to research from the Direct Marketing Association (DMA) email returns $40 for every $1 spend on average. In addition, the same study found that email marketing has a buy rate 1000% higher than social media (such as Facebook and Twitter), and double that of organic search engine marketing (SEO).

تتميز شركتنا نقل اثاث بالجبيل بتحدید متطلبات العملاء و الخدمات المطلوبة و اي خدمات اضافیة اخرى مع توفیرھا بجودة عالیة . سرعة الاستجابة والتواصل فى عملیة نقل الاثاث والعفش دون اى تاخیر او تسویف . فنیین فى جمیع التخصصات متمیزین ومھندسین ذو خبرة عالیة حقا و معدات حدیثھ في فك و تركیب العفش . الاف العربات الممیزة التي نستعملھا في تلبیة حاجة العملاء ادارة مرنة وقویة ومحكمة وایضا متفاھمة جدا فى التعامل مع العملاء الكرام وقادرة علي تلبیة طلبات عملائھا . ارخص شركة نقل اثاث بالدمام

By default, extract-key is applied to two list elements for every comparison, but if cache-keys? is true, then the extract-key function is used exactly once for each list item. Supply a true value for cache-keys? when extract-key is an expensive operation; for example, if file-or-directory-modify-seconds is used to extract a timestamp for every file in a list, then cache-keys? should be #t to minimize file-system calls, but if extract-key is car, then cache-keys? should be #f. As another example, providing extract-key as (lambda (x) (random)) and #t for cache-keys? effectively shuffles the list.
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