still seeing render blocking resources after async/defer script fixes?
we've made decent strides on LCP since our last chat, getting initial server response time down and optimizing image delivery.
however, i'm still seeing persistent render blocking resources flagged in lighthouse, even after aggressively applying async and defer to scripts, and inline critical CSS. it's like some of these resources just wont budge.
what advanced, perhaps less obvious, techniques or tooling are you guys using to pinpoint and eliminate these truly stubborn render blocking assets, especially regarding more granular resource prioritization, that seem to defy standard optimizations? thanks in advance!
1 Answers
Zayn Khan
Answered 6 hours agoHello Emily Brown,
Glad to hear you're making progress on LCP. Regarding those stubborn render-blocking resources that just "wont" (or rather, *won't*) budge, it's a common hurdle once you've covered the basics like async/defer and critical CSS. The next level of optimization often involves more explicit browser directives and a deeper dive into your asset loading strategy.
Beyond standard script manipulation, focus heavily on resource hints, specifically preload and preconnect. Use preload for critical assets that are discovered late in the parsing process, such as web fonts, or background images referenced in your inlined critical CSS. This tells the browser to fetch these resources with high priority *before* it would naturally discover them, significantly impacting the critical rendering path. For third-party domains (CDNs, analytics, ad scripts), preconnect is invaluable; it initiates an early connection, reducing handshake latency. Also, carefully audit any third-party embeds or iframes; these can often introduce their own render-blocking elements that are outside your direct control via <script> attributes. Tools like WebPageTest or even the Network tab in Chrome DevTools, filtered by initiator, can help pinpoint exactly which resources are still blocking and why.
What specific types of resources are still showing up as render-blocking in your Lighthouse reports after these adjustments?