{ "slug": "render_blocking_resources", "term": "Render-Blocking Resources", "category": "frontend", "difficulty": "intermediate", "short": "CSS and synchronous JavaScript in that prevent the browser from rendering any content until they are downloaded and parsed — the primary cause of slow First Contentful Paint.", "long": "The browser cannot render until it has the CSSOM (from CSS) and has executed synchronous scripts. Every and \n \n \n", "good_code": "\n \n \n \n", "quick_fix": "Add defer to all non-critical