{"id":17640,"date":"2021-11-15T12:55:28","date_gmt":"2021-11-15T18:55:28","guid":{"rendered":"https:\/\/www.dotcom-tools.com\/web-performance\/?page_id=17640"},"modified":"2021-11-15T12:55:28","modified_gmt":"2021-11-15T18:55:28","slug":"reduce-unused-css","status":"publish","type":"page","link":"https:\/\/www.dotcom-tools.com\/web-performance\/lighthouse\/reduce-unused-css\/","title":{"rendered":"Lighthouse Optimizations &#8211; Reduce Unused CSS"},"content":{"rendered":"<p>[vc_row full_width=&#8221;stretch_row&#8221; gap=&#8221;25&#8243; equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; css=&#8221;.vc_custom_1636408663624{padding-top: 100px !important;padding-bottom: 100px !important;background-image: url(https:\/\/www.dotcom-tools.com\/blog\/wp-content\/uploads\/2015\/09\/hero-section-with-description-3320.jpg?id=15799) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221;][vc_column css=&#8221;.vc_custom_1636409653940{padding-top: 30px !important;padding-bottom: 30px !important;background-color: #e6eaef !important;}&#8221;][vc_custom_heading text=&#8221;<b>Reduce Unused CSS<\/b>&#8221; font_container=&#8221;tag:h1|font_size:40|text_align:center|color:%232b2b2b|line_height:1.5&#8243; use_theme_fonts=&#8221;yes&#8221; css=&#8221;.vc_custom_1637002383866{padding-top: 30px !important;padding-bottom: 30px !important;}&#8221;][\/vc_column][\/vc_row][vc_row margin_top=&#8221;40&#8243; margin_bottom=&#8221;30px&#8221; css=&#8221;.vc_custom_1636409410012{margin-bottom: 30px !important;}&#8221;][vc_column][vc_custom_heading text=&#8221;CSS: Another Render-blocking Resource&#8221; font_container=&#8221;tag:h2|font_size:35|text_align:center|color:%232b2b2b|line_height:1.5&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text css=&#8221;.vc_custom_1637002496142{padding-right: 5px !important;}&#8221;]<\/p>\n<p style=\"font-size: 16px;\">Just like reducing unused JavaScript, reducing unused CSS files is another basic optimization that you should be regularly reviewing. Unnecessary CSS, like JavaScript, can cause render-blocking behavior to occur, which will delay when the other aspects of your page, like First Paint, will occur. Additionally, style sheets rules that are not being used for critical, above-the-fold content do nothing but affect performance and the user perceived load time. This is especially true for external style sheets since these extra network trips just increase the time until content can start being displayed on the page.<\/p>\n<p>[\/vc_column_text][vc_custom_heading text=&#8221;How to Reduce Unused CSS&#8221; font_container=&#8221;tag:h3|font_size:30|text_align:center|color:%232b2b2b|line_height:1.5&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text]<\/p>\n<p style=\"font-size: 16px;\">Before a page can render the actual styles on a page, the browser must download, parse, and execute the files. If there is any unused CSS, this is just inefficient, as the browser will naturally take longer to process a larger file. Within Lighthouse reports, if there are any stylesheets identified that can save more than 2kB or more, they will be listed with their size and their potential size. You will want to review the style sheets and decide on what rules are critical versus non-critical versus no longer necessary. For style sheets that are critical, using inlining CSS directly into HTML is a great method to utilize to help reduce the number of files and to render these resources as soon as possible. Another option, which we discussed earlier in this guide about JavaScript, is code splitting. This entails splitting your critical and non-critical CSS, so the critical CSS is processed and rendered first. The non-critical CSS is processed later. <\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row margin_top=&#8221;60&#8243; margin_bottom=&#8221;0&#8243; css=&#8221;.vc_custom_1636595147911{margin-bottom: 15px !important;}&#8221;][vc_column width=&#8221;1\/3&#8243; css=&#8221;.vc_custom_1636595227743{padding-top: 60px !important;padding-bottom: 60px !important;padding-left: 10px !important;background-color: #f6f6f6 !important;}&#8221;][vc_single_image image=&#8221;17233&#8243; alignment=&#8221;center&#8221; style=&#8221;vc_box_rounded&#8221;][vc_custom_heading text=&#8221;<b>Lighthouse<\/b>&#8221; font_container=&#8221;tag:p|font_size:20|text_align:center|color:%232b2b2b|line_height:1&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\">Lighthouse is an open-source tool that is used to run an audit against your web pages and provides scores and suggestions for improving page performance, accessibility, SEO, and more.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Learn More&#8221; style=&#8221;flat&#8221; color=&#8221;primary&#8221; align=&#8221;center&#8221; i_icon_fontawesome=&#8221;fas fa-location-arrow&#8221; add_icon=&#8221;true&#8221; link=&#8221;url:https%3A%2F%2Fwww.dotcom-tools.com%2Fweb-performance%2Flighthouse%2F&#8221;][\/vc_column][vc_column width=&#8221;1\/3&#8243; css=&#8221;.vc_custom_1636595173585{padding-top: 60px !important;padding-bottom: 60px !important;background-color: #f6f6f6 !important;}&#8221;][vc_single_image image=&#8221;17284&#8243; alignment=&#8221;center&#8221; style=&#8221;vc_box_rounded&#8221;][vc_custom_heading text=&#8221;<b>PageSpeed Terms<\/b>&#8221; font_container=&#8221;tag:p|font_size:20|text_align:center|color:%232b2b2b|line_height:1&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\">PageSpeed Insights is a tool created by Google that reports on the performance of a page on both mobile and desktop devices, and provides suggestions on how that page may be improved.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Learn More&#8221; style=&#8221;flat&#8221; color=&#8221;primary&#8221; align=&#8221;center&#8221; i_icon_fontawesome=&#8221;fas fa-location-arrow&#8221; add_icon=&#8221;true&#8221; link=&#8221;url:https%3A%2F%2Fwww.dotcom-tools.com%2Fweb-performance%2Fpagespeed%2F&#8221;][\/vc_column][vc_column width=&#8221;1\/3&#8243; css=&#8221;.vc_custom_1636595196399{padding-top: 60px !important;padding-right: 10px !important;padding-bottom: 60px !important;background-color: #f6f6f6 !important;}&#8221;][vc_single_image image=&#8221;17281&#8243; alignment=&#8221;center&#8221; style=&#8221;vc_box_rounded&#8221;][vc_custom_heading text=&#8221;<b>YSlow<\/b>&#8221; font_container=&#8221;tag:p|font_size:20|text_align:center|color:%232b2b2b|line_height:1&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text]<\/p>\n<p style=\"text-align: center;\">YSlow is an open-source website analysis tool that can be used to identify web page performance issues. Learn more about the YSlow to enhance your web pages and the user experience.<\/p>\n<p>[\/vc_column_text][vc_btn title=&#8221;Learn More&#8221; style=&#8221;flat&#8221; color=&#8221;primary&#8221; align=&#8221;center&#8221; i_icon_fontawesome=&#8221;fas fa-location-arrow&#8221; add_icon=&#8221;true&#8221; link=&#8221;url:https%3A%2F%2Fwww.dotcom-tools.com%2Fweb-performance%2Fyslow%2F&#8221;][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[vc_row full_width=&#8221;stretch_row&#8221; gap=&#8221;25&#8243; equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; css=&#8221;.vc_custom_1636408663624{padding-top: 100px !important;padding-bottom: 100px !important;background-image: url(https:\/\/www.dotcom-tools.com\/blog\/wp-content\/uploads\/2015\/09\/hero-section-with-description-3320.jpg?id=15799) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221;][vc_column css=&#8221;.vc_custom_1636409653940{padding-top: 30px !important;padding-bottom: 30px !important;background-color: #e6eaef !important;}&#8221;][vc_custom_heading text=&#8221;Reduce Unused CSS&#8221; font_container=&#8221;tag:h1|font_size:40|text_align:center|color:%232b2b2b|line_height:1.5&#8243; use_theme_fonts=&#8221;yes&#8221; css=&#8221;.vc_custom_1637002383866{padding-top: 30px !important;padding-bottom: 30px !important;}&#8221;][\/vc_column][\/vc_row][vc_row margin_top=&#8221;40&#8243; margin_bottom=&#8221;30px&#8221; css=&#8221;.vc_custom_1636409410012{margin-bottom: 30px !important;}&#8221;][vc_column][vc_custom_heading text=&#8221;CSS: Another Render-blocking Resource&#8221; font_container=&#8221;tag:h2|font_size:35|text_align:center|color:%232b2b2b|line_height:1.5&#8243; use_theme_fonts=&#8221;yes&#8221;][vc_column_text css=&#8221;.vc_custom_1637002496142{padding-right: 5px !important;}&#8221;] Just like reducing unused JavaScript, reducing&hellip;<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":17260,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.6 (Yoast SEO v19.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>Lighthouse Optimizations - Reduce Unused CSS | Dotcom-Monitor Tools Blog<\/title>\r\n<meta name=\"description\" content=\"How do you reduce unused CSS files? 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