What is the process for identifying and optimizing browser rendering-blocking resources?
When needing to improve web page loading performance, identifying and optimizing browser rendering-blocking resources typically involves three core steps: determining resource types, analyzing blocking impacts, and implementing targeted optimizations. Key blocking resources are mainly CSS (render-blocking) and JavaScript (parsing/execution-blocking), whose loading order and execution timing directly affect first-screen rendering time. The identification phase can be achieved through browser tools: the Network panel marks "blocking" resource types, the Performance panel tracks rendering-blocking events; the Lighthouse report quantifies the impact of blocking resources on loading speed. Optimization needs to be handled based on resource types: at the CSS level, inline critical CSS into the HTML head and asynchronously load non-critical stylesheets; at the JavaScript level, use async/defer attributes for non-critical scripts, or delay loading via dynamic import(), and avoid placing non-asynchronous scripts in the <head>. It is recommended to prioritize optimizing first-screen critical path resources, regularly check the proportion of blocking resources using Chrome DevTools, and gradually improve the first-screen loading speed of web pages.
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