How to Leverage PurgeCSS in Your Rails App for Faster Stylesheets - FastRuby.io | Rails Upgrade Service

Large Rails apps often ship CSS bloated with unused framework classes. Learn how to add PurgeCSS to your asset pipeline to strip dead styles and speed up page loads.PurgeCSS is a tool that analyzes your content and CSS, then removes unused CSS selectors, stripping away dead weight to leave you with lean, optimized stylesheets. For example, if you’re using the full Bootstrap CSS framework (approximately 200KB) but only utilizing 30% of its components, PurgeCSS can scan your HTML (ERB files), JavaScript (including Stimulus controllers), and other templates to identify which Bootstrap classes you actually use. It then generates a new CSS file containing only those classes, potentially reducing your Bootstrap footprint by 70% or more.