{"id":634,"date":"2026-01-20T10:50:48","date_gmt":"2026-01-20T10:50:48","guid":{"rendered":"https:\/\/voxillustration.com\/blog\/?p=634"},"modified":"2026-01-20T10:50:48","modified_gmt":"2026-01-20T10:50:48","slug":"common-image-illustration-mistakes-that-hurt-website-speed","status":"publish","type":"post","link":"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/","title":{"rendered":"Common Image Illustration Mistakes That Hurt Website Speed"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Images and illustrations are among the most important elements that make a website interactive. We designers often use them to give a clean and modern look to a website. Yet image optimization makes a website&#8217;s face very attractive, but it can sometimes slow down the website&#8217;s speed. And the thing is that no one is going to stay on a website whose pages load slowly. Users leave slow websites, which also has an impact on search engine rankings. The reason? Well, there are many. Read on as we address common image-optimization mistakes that directly hurt a website&#8217;s speed.\u00a0<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_75 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#Why_Image_Illustrations_Affect_Website_Speed\" >Why Image Illustrations Affect Website Speed?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#1_Using_a_Very_High_Resolution\" >1. Using a Very High Resolution<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#2_Uploading_Without_Compression\" >2. Uploading Without Compression<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#3_Choosing_the_Wrong_Image_Format\" >3. Choosing the Wrong Image Format<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#4_Ignoring_Responsive_Image_Sizes\" >4. Ignoring Responsive Image Sizes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#5_Loading_All_Illustrations_at_Once\" >5. Loading All Illustrations at Once<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#How_Do_These_Mistakes_Hurt_Core_Web_Vitals\" >How Do These Mistakes Hurt Core Web Vitals?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/#Bottom_Line\" >Bottom Line<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Image_Illustrations_Affect_Website_Speed\"><\/span><b>Why Image Illustrations Affect Website Speed?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Every image added to a website is uploaded to its hosting server, consuming storage space. When that image is added to a web page, it also increases the page weight and size. When a page&#8217;s size (or weight) increases, the browser will take longer to load the content unless the image is optimized according to best practices.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In addition to simple images, some developers use <\/span><a href=\"https:\/\/voxillustration.com\/\"><span style=\"font-weight: 400;\">illustrations<\/span><\/a><span style=\"font-weight: 400;\"> that may appear simple but still have large file sizes. They also slow down a website&#8217;s speed when added without proper optimization. The issue worsens on small screens, such as mobile devices, and on slow connections. Here are the most common mistakes people make when using image illustrations on websites, which can slow website performance.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Using_a_Very_High_Resolution\"><\/span><b>1. Using a Very High Resolution<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">High-resolution images are not intended for websites. They are usually meant for printing on large flex or banners. Still, many use them on websites they do not need because they are very large.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, when you upload a large image, the page size increases too much. As a result, the browser takes longer to load the image, and users opening the website will notice slow load times.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This mistake usually happens when:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Designers export illustrations without resizing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Site owners reuse print assets on the web<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">People ignore the actual display size<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This problem\/mistake can be fixed by resizing illustrations to match their display size.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Uploading_Without_Compression\"><\/span><b>2. Uploading Without Compression<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">For websites, image compression is usually considered a good practice. Many designers <\/span><a href=\"https:\/\/imagetotext.me\/image-compressor\"><b>compress images<\/b><\/a><span style=\"font-weight: 400;\"> before uploading them to websites. But some upload images directly from design tools without compression. Know that even flat illustrations with few colors can have large file sizes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Compression removes unnecessary data from images. Without it, browsers load extra information that users never see.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This mistake hurts speed the most on:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mobile devices<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slow internet connections<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Image-heavy landing pages<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">As a web developer\/designer, always compress all images before uploading them to your website. The smaller the image file size, the faster the web page loads.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Choosing_the_Wrong_Image_Format\"><\/span><b>3. Choosing the Wrong Image Format<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Image format also plays a big role in website speed. Many site owners stick to one format for everything. That approach causes problems, especially for illustrations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">PNG files work well for transparency, but often stay heavy<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">JPG works better for photos, but not for flat graphics<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">SVG fits icons and vector illustrations perfectly<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When people choose the wrong format, the file size increases without reason.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you don\u2019t want to hurt your website speed, try matching the format to the illustration type. For example, you can use SVG for icons and vector designs. For the rest of the image, prefer using modern image formats like WebP. They will reduce the image file size and load quickly while maintaining image quality.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Ignoring_Responsive_Image_Sizes\"><\/span><b>4. Ignoring Responsive Image Sizes<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Many websites load the same large illustration on all devices. This means a mobile user downloads the same file as a desktop user. That practice wastes data and slows down mobile browsing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Since most traffic now comes from mobile devices, this mistake causes serious performance issues.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common signs of this problem include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slow loading on phones<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">High bounce rate on mobile<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Poor mobile speed scores<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">To fix this, use responsive image sizes that scale to all screen sizes. For example, by defining rules on the back end, you can serve smaller images to mobile users and larger ones to desktop users. This will help you reduce load time and ultimately improve overall user experience across all devices.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Loading_All_Illustrations_at_Once\"><\/span><b>5. Loading All Illustrations at Once<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Some pages load every image as soon as the page opens. This includes illustrations that appear far below the fold. As a result, the browser loads too much content at once.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Long pages with many illustrations suffer the most from this issue. Users wait longer even though they only see the top part of the page.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This can be fixed by using lazy loading. When you enable lazy loading, the image illustration section loads only when the user scrolls toward it. This means the browser will not have to wait for the full page to load on the user&#8217;s device. Ultimately, the page loads faster, and users have a smoother web experience.\u00a0<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_These_Mistakes_Hurt_Core_Web_Vitals\"><\/span><b>How Do These Mistakes Hurt Core Web Vitals?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Google uses Core Web Vitals to measure user experience. Image mistakes directly affect these metrics.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here\u2019s how:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Large images slow down Largest Contentful Paint (LCP)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Heavy layouts increase loading time<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Poor image handling hurts overall page performance<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When Core Web Vitals suffer, rankings can drop. Users also become impatient and leave sooner.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Bottom_Line\"><\/span><b>Bottom Line<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Image illustrations can either help or hurt your website speed. When you make the above-discussed mistakes in using image illustrations on your website, its loading speed slows down. As a result, users leave, and rankings also drop. So, optimize images properly, focus on mobile users, and load only what matters first.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Images and illustrations are among the most important elements that make a website interactive. We designers often use them to give a clean and modern look to a website. Yet image optimization makes a website&#8217;s face very attractive, but it can sometimes slow down the website&#8217;s speed. And the thing is that no one is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":635,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-illustration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Common Image Illustration Mistakes That Hurt Website Speed<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/voxillustration.com\/blog\/common-image-illustration-mistakes-that-hurt-website-speed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common Image Illustration Mistakes That Hurt Website Speed\" \/>\n<meta property=\"og:description\" content=\"Images and illustrations are among the most important elements that make a website interactive. We designers often use them to give a clean and modern look to a website. Yet image optimization makes a website&#8217;s face very attractive, but it can sometimes slow down the website&#8217;s speed. 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