{"id":8717,"date":"2018-12-19T15:03:47","date_gmt":"2018-12-19T21:03:47","guid":{"rendered":"https:\/\/www.mediavine.com\/?p=8717"},"modified":"2020-09-08T10:03:26","modified_gmt":"2020-09-08T15:03:26","slug":"what-is-a-cache","status":"publish","type":"post","link":"https:\/\/www.mediavine.com\/blog\/what-is-a-cache\/","title":{"rendered":"What Is A Cache?"},"content":{"rendered":"\r\n<div class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0;margin-bottom:0;padding-top:0;padding-bottom:0\">\r\n<article class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:0;padding-bottom:0\">\r\n<section class=\"wp-block-group alignfull is-style-beige has-global-padding is-layout-constrained wp-container-core-group-is-layout-772205c6 wp-block-group-is-layout-constrained is-style-beige--1\" style=\"padding-top:var(--wp--preset--spacing--50)\">\r\n<header class=\"wp-block-group c-breadcrumbs aligngrid has-global-padding is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-61973aa6 wp-block-group-is-layout-constrained\" style=\"margin-top:0;margin-bottom:0\">\r\n<header class=\"wp-block-group aligngrid is-content-justification-left is-nowrap is-layout-flex wp-container-core-group-is-layout-d68226ec wp-block-group-is-layout-flex\" style=\"margin-top:0;margin-bottom:var(--wp--preset--spacing--30)\">\r\n<figure class=\"wp-block-image size-large is-resized\" style=\"margin-bottom:5px\"><img decoding=\"async\" src=\"https:\/\/mediavine-dev.d1.moderntribe.qa\/wp-content\/uploads\/2025\/10\/chevron-left2.svg\" alt=\"\" class=\"wp-image-542\" style=\"aspect-ratio:9\/16;object-fit:contain;width:auto;height:20px\"\/><\/figure>\r\n\r\n\r\n\r\n<p class=\"is-style-small is-style-small--2\"><a href=\"\/blog\/\">Back to Blog<\/a><\/p>\r\n<\/header>\r\n\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity aligngrid\" style=\"margin-top:0;margin-bottom:0\"\/>\r\n<\/header>\r\n<\/section>\r\n\r\n\r\n\r\n<section class=\"wp-block-group alignfull is-style-default has-neutral-20-background-color has-background has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-bottom:var(--wp--preset--spacing--70);padding-top:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--60)\"><div class=\"aligncenter aligncenter wp-block-tribe-terms\"><ul class=\"wp-block-tribe-terms__list\"><li class=\"wp-block-tribe-terms__term\"><span class=\"wp-block-tribe-terms__link t-category\">General Blogging<\/span><\/li><\/ul><\/div>\r\n\r\n<h1 style=\"margin-top:var(--wp--preset--spacing--10);\" class=\"has-text-align-center wp-block-post-title\">What Is A Cache?<\/h1>\r\n\r\n\r\n<div class=\"wp-block-group is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-9b38c6d9 wp-block-group-is-layout-flex\" style=\"margin-top:var(--wp--preset--spacing--30);margin-bottom:0;padding-top:0;padding-bottom:0\"><div style=\"margin-bottom:0;margin-top:0;margin-left:0;margin-right:0;\" class=\"has-text-align-center wp-block-post-author-name\">The Mediavine Team<\/div>\r\n\r\n\r\n<p>\u2022<\/p>\r\n\r\n\r\n<div style=\"padding-top:0;padding-bottom:0;padding-left:0;padding-right:0;margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;\" class=\"has-text-align-center wp-block-post-date has-10-font-size\"><time datetime=\"2018-12-19T15:03:47-06:00\">December 19, 2018<\/time><\/div><\/div>\r\n<\/section>\r\n\r\n\r\n\r\n<section class=\"wp-block-group alignfull has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"padding-top:0;padding-bottom:0\"><h3>What in the world is caching and why should I care?<\/h3>\nLet\u2019s start with a story.\n\nImagine you go to a restaurant. It&#8217;s your first time, so you sit down at your table and look through the menu. You&#8217;re reading the instructions of this restaurant.\n\n<!--more-->\n\nYou learn the names of the foods, the categories, you even see pictures and learn about Happy Hour deals. You pick the <a href=\"https:\/\/www.dessertfortwo.com\/chicken-cacciatore-recipe\/\" target=\"_blank\" rel=\"noopener noreferrer\">Chicken Cacciatore<\/a> with tomatoes, bell pepper and capers. It&#8217;s divine. You&#8217;ve never had chicken so tender and flavorful.\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8739\" src=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant.png\" alt=\"What is a cache?\" width=\"800\" height=\"533\" srcset=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant.png 800w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant-441x294.png 441w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant-768x512.png 768w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant-690x460.png 690w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/restaurant-735x490.png 735w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n\nYou tell your waiter, \u201cI couldn&#8217;t stand it. Which is why you don&#8217;t see it on my plate anymore.\u201d He laughs politely, pretending he&#8217;s never heard that joke before. \u201cWould you like a refund?\u201d he jests. You both chuckle a bit and you depart the restaurant contentedly.\n\nNext week, you go to the same restaurant at the same time and you get the same waiter. He remembers you, too, and says, \u201cthe usual?\u201d\n\nTen minutes later, you\u2019re eating that delicious Chicken Cacciatore with tomatoes, bell pepper and capers again. So fast. So delicious. #blessed\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7848\" src=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer.jpg\" alt=\"using a computer\" width=\"800\" height=\"532\" srcset=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer.jpg 800w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer-441x293.jpg 441w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer-768x511.jpg 768w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer-692x460.jpg 692w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/hands-computer-735x489.jpg 735w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n<h3>That\u2019s a great story, but what does this have to do with my site?<\/h3>\nIn this story, you are the reader of a site. You go to <span style=\"text-decoration: underline;\">https:\/\/thegreatestblogever.com<\/span> (obviously your site) for the first time and have to wait a little while as it loads. What\u2019s happening here?\n\nYour internet browser sends a <strong>request<\/strong> to the website\u2019s host (<strong>server<\/strong>) asking for the specific page you\u2019re visiting. The server performs a lot of logic and <strong>responds<\/strong> with a bunch of information. It gives your browser the outline (HTML) of the site, fills in the data from the database (the post title and content, the recipe card, comments, author information, links to images, style information \u2014 CSS \u2014 and JavaScript for the interactive bits \u2014 ads, share buttons, post ratings, videos).\n\nThat\u2019s a lot of work for both the server and the browser. And this request-response cycle happens <em>every single time you visit a page<\/em>.\n\nBut this isn\u2019t very efficient, which is pretty contradictory to the concept of computers and the internet. Something needs to speed this up. Along comes caching. There are many methods for caching and many places it can happen, but there are generally two types that concern your site.\n<h4>Browser caching<\/h4>\nThe first is <strong>browser caching<\/strong>. This technically has very little to do with your site and everything to do with your reader\u2019s internet browser.\n\nRecall our story \u2014 the one with the menu and the waiter with the great memory and delightful sense of humor. The first time your reader visits your site, their browser has to tell the host (web server) that it wants to see the page. The web server sits the browser down at a table, gives it a menu (the HTML and other data) and all the information the browser needs to make its decisions.\n\nThe browser looks through all the information and starts gathering all of the information: It uses the links to the images, CSS and JavaScript, and begins downloading each file. As your reader waits for the page to load, the website shows them a loading animation (the familiar joke you share with the waiter). In an <em><strong>ideal<\/strong><\/em> situation, this should all happen in less than 10 seconds on a 4G mobile internet connection.\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-8754\" src=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/Mediavine-Pins-with-Photos-5.png\" alt=\"What is a cache? How caching works to provide a better user experience. (via Mediavine)\" width=\"800\" height=\"1199\" srcset=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/Mediavine-Pins-with-Photos-5.png 735w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/Mediavine-Pins-with-Photos-5-200x300.png 200w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/12\/Mediavine-Pins-with-Photos-5-307x460.png 307w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n<h4>Browser-side caching<\/h4>\nThe browser is built to assume the reader will visit the site again, so it uses <strong>browser-side caching<\/strong>. All this means is that the browser saves the HTML, images, CSS, JavaScript and other resources it downloaded the first time on the reader\u2019s computer. The next time your reader visits the site, their browser sends the same request to the web server and gets a similar <strong>response<\/strong>.\n\nThis time, the browser looks at the response and determines what information has changed. It then only downloads the new information and uses the saved (<strong>cached<\/strong>) data for the rest of the page. Now it only takes 5 seconds to load on a 4G mobile internet connection. Much better.\n\n<strong>But 5 seconds is too long. And 10 seconds is way too long!<\/strong>\n\nYou\u2019re right! 10 seconds is most of the time you have to capture your reader\u2019s attention. Not good. Not good at all. How can you fix this? What can you do to make your site load faster? You can do a lot, actually! But this post is about caching, so we\u2019ll start there.\n\nWe\u2019ve talked about browser caching, which is fantastic, but it only helps the second time a reader visits a page on your site. What about the first? If they don\u2019t come back after the first, what good is caching at all?\n\nExcellent questions! Thank you for asking.\n\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7701\" src=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing.jpg\" alt=\"Hands typing on a laptop computer.\" width=\"800\" height=\"533\" srcset=\"https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing.jpg 800w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing-441x294.jpg 441w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing-768x512.jpg 768w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing-690x460.jpg 690w, https:\/\/www.mediavine.com\/wp-content\/uploads\/2018\/10\/laptop-editing-735x490.jpg 735w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n<h4>Server-side caching<\/h4>\nBrowser caching is the first type of cache we talked about. Luckily for you, there\u2019s another type that you can control: <strong>server-side caching<\/strong>.\n\nYou\u2019re familiar with the server. It\u2019s where your website lives \u2014 the database, the WordPress installation, the images; all of these reside on your host\u2019s web server. Remember, when a reader visits your site, their browser makes a request to your web server and asks for all the information it needs to show the web page.\n\nWhen your server receives that request, it has to go through a lot of steps and perform a lot of tasks to return a response to the browser. It starts by reading the request and determining what page the browser wants to see; it looks for the HTML outline, collects all of the database information about the page\/post (title, content, metadata, related posts, etc.), grabs all the links to the images, JavaScript and CSS. This can take several seconds, depending on your host and the plan you\u2019re on.\n\nServer-side caching can speed this process along by allowing your server to store (cache) the response (the HTML, database information, post metadata, etc) and send that to the browser when the page is requested. This can drastically reduce the time it takes for your server to respond to your reader\u2019s browser. Now what took 10 seconds to load might only take 5 the first time, and only 2-3 seconds the second time. A great improvement!\n\n<span style=\"font-weight: 400;\">So far, caching seems awesome. But if you\u2019ve been around a while, I\u2019m willing to bet you\u2019ve run into some issues with caching. What causes these issues? What can we do to prevent these issues from occurring? Find out in part two of this post!<\/span>\n\n<span style=\"font-weight: 400;\"><strong>NOTE:<\/strong>\u00a0Server-side caching can be managed by a caching plugin or through your server portal (sometimes this can only be managed by your host). You only need one method of server-side caching, so, if you\u2019re using a caching plugin, check with your host to make sure the server isn\u2019t performing extra caching.<\/span>\n\n<span style=\"font-weight: 400;\"><strong>NOTE 2:<\/strong>\u00a0Page load times are generalized for simplicity\u2019s sake and are loosely based on the standards set out by Google for page load speed requirements. Your results will vary depending on the complexity of your site and what hosting plan you use.<\/span><\/section>\r\n\r\n\r\n\r\n<section class=\"wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:0\">\r\n<div class=\"wp-block-group has-global-padding is-layout-constrained wp-container-core-group-is-layout-09aec4f2 wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--40);padding-top:var(--wp--preset--spacing--50);padding-right:0;padding-bottom:var(--wp--preset--spacing--60)\">\r\n<p class=\"is-style-small is-style-small--3\">About the author<\/p>\r\n\r\n\r\n<div style=\"margin-top:var(--wp--preset--spacing--20);\" class=\"wp-block-post-author\"><div class=\"wp-block-post-author__avatar\"><img alt='' src='https:\/\/secure.gravatar.com\/avatar\/e3220aded17a2f76bff75294b4d13f344d81294787c0a43b7aa017ba65d79008?s=96&#038;d=blank&#038;r=g' 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We&#8217;ve all seen the headlines questioning the future of organic search, the impact on creators&#8217; livelihoods and content ownership, the challenge of&#8230;<\/p>\n\t\t\t<\/div>\n\t<a href=\"https:\/\/www.mediavine.com\/blog\/5-ways-chatgpt-increase-productivity\/\" class=\"c-post-card__link-overlay\" aria-label=\"Read more about 5 Ways Bloggers Can Use ChatGPT to Increase Productivity\"><\/a>\n<\/article>\n\t<\/div>\n<\/aside>\r\n<\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Back to Blog \u2022 What in the world is caching and why should I care? Let\u2019s start with a story. Imagine you go to a restaurant. It&#8217;s your first time, so you sit down at your table and look through the menu. You&#8217;re reading the instructions of this restaurant. What in the world is caching&#8230;<\/p>\n","protected":false},"author":44459,"featured_media":21699,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":"","footnotes":""},"categories":[60],"tags":[],"audience_post":[],"class_list":["post-8717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-blogging"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is A Cache? - Mediavine<\/title>\n<meta name=\"description\" content=\"Learn how your site remembers your users to provide them with a better user experience. 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