How to improve the loading speed of critical resources using Server Push technology?

When it is necessary to improve the loading speed of critical web resources (such as CSS and JS), Server Push technology can reduce critical rendering path blocking by proactively pushing resources before client requests, typically shortening the first screen loading time by 10%-30%. Critical resource identification: Prioritize pushing core resources necessary for first-screen rendering, such as basic CSS and critical JS files, and avoid pushing unnecessary resources (such as low-priority images and non-first-screen scripts) to prevent bandwidth waste. Push strategy control: Trigger pushes through HTTP Link headers (e.g., `<link rel="preload" as="style">`) or server configurations (e.g., Nginx's `http2_push` directive). It is generally necessary to limit the number of resources pushed at a time (recommended no more than 5) to avoid excessive server load. During implementation, it is recommended to first analyze resource priorities using tools like Lighthouse, adjust push rules based on user access paths, monitor server logs to avoid re-pushing cached resources, and regularly test the impact of different push combinations on loading speed to further optimize results.