[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"topic:css-performance-TAnsqs":6,"course-tree":90,"blog-categories":816},{"data":4},{"google_site_verification":5,"ga4_measurement_id":5,"site_name":5,"default_og_image":5,"twitter_handle":5},null,{"data":7},{"id":8,"title":9,"slug":10,"content":11,"course":12,"subcategory":15,"author":18,"reading_time_minutes":24,"cornerstone":25,"schema_type":26,"faq_json":5,"video_url":5,"canonical_url":27,"meta_title":28,"meta_description":29,"og_image":5,"toc_json":30,"code_examples":63,"quiz":5,"exercises":72,"published_at":5,"updated_at":81,"prev":82,"next":86},161,"CSS Performance","css-performance-TAnsqs","\u003Ch1 id=\"css-performance\">CSS Performance\u003C\u002Fh1>\u003Cp>Optimizing \u003Cstrong>CSS performance\u003C\u002Fstrong> directly affects how fast a page renders and feels to users. This guide covers render-blocking CSS, selector efficiency, critical CSS, and practical techniques to keep stylesheets lean and fast-loading.\u003C\u002Fp>\u003Ch2 id=\"why-css-performance-matters\">Why CSS Performance Matters\u003C\u002Fh2>\u003Cp>CSS is render-blocking by default — browsers won't paint content until stylesheets are downloaded and parsed. Poor \u003Cstrong>CSS performance\u003C\u002Fstrong> directly delays First Contentful Paint and hurts Core Web Vitals scores, which also affects SEO rankings.\u003C\u002Fp>\u003Ch2 id=\"1-render-blocking-css\">1. Render-Blocking CSS\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Issue\u003C\u002Fth>\u003Cth>Impact\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Large stylesheets loaded in <head>\u003C\u002Ftd>\u003Ctd>Delays page rendering until fully downloaded and parsed\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>@import statements in CSS\u003C\u002Ftd>\u003Ctd>Creates additional blocking requests, loaded sequentially\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Unused CSS rules\u003C\u002Ftd>\u003Ctd>Increases file size without adding value\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Ch2 id=\"2-critical-css\">2. Critical CSS\u003C\u002Fh2>\u003Cp>\u003Cstrong>Critical CSS\u003C\u002Fstrong> means inlining only the styles needed for above-the-fold content directly in the HTML \u003Ccode><head>\u003C\u002Fcode>, then loading the rest of the stylesheet asynchronously. This lets the browser paint visible content immediately without waiting for the full CSS file.\u003C\u002Fp>\u003Ch2 id=\"3-selector-efficiency\">3. Selector Efficiency\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Selector Type\u003C\u002Fth>\u003Cth>Performance Note\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd>.class\u003C\u002Ftd>\u003Ctd>Fast — browsers match class selectors efficiently\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>#id\u003C\u002Ftd>\u003Ctd>Fast, but creates high specificity issues\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>div > p > span\u003C\u002Ftd>\u003Ctd>Slower — deep combinators require more matching work\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>* (universal selector)\u003C\u002Ftd>\u003Ctd>Slowest — applies matching logic to every element\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Ch2 id=\"4-reducing-css-file-size\">4. Reducing CSS File Size\u003C\u002Fh2>\u003Cul>\u003Cli>Remove unused CSS with tools like PurgeCSS\u003C\u002Fli>\u003Cli>Minify CSS files for production (removes whitespace and comments)\u003C\u002Fli>\u003Cli>Avoid duplicate rules across multiple stylesheets\u003C\u002Fli>\u003Cli>Use shorthand properties (e.g. \u003Ccode>margin: 10px 20px;\u003C\u002Fcode> instead of four separate lines)\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"5-reducing-layout-thrashing\">5. Reducing Layout Thrashing\u003C\u002Fh2>\u003Cp>Changing CSS properties like \u003Ccode>width\u003C\u002Fcode>, \u003Ccode>height\u003C\u002Fcode>, or \u003Ccode>top\u003C\u002Fcode> repeatedly via JavaScript forces the browser to recalculate layout (reflow) and repaint. Prefer animating \u003Ccode>transform\u003C\u002Fcode> and \u003Ccode>opacity\u003C\u002Fcode>, which the browser can handle on the compositor thread without triggering reflow.\u003C\u002Fp>\u003Ch2 id=\"6-loading-css-asynchronously\">6. 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