Kent points out that HTTP/2 support on the site can improve performance without merging files, because HTTP/2 improves the efficiency of downloading several small files at the same time.
- Document.write function which, if used improperly, can cause significant performance problems on a page as it blocks the execution of other operations. For example, performance tests have shown that adding a script inclusion via document.write can double the loading time of a web page, especially on slow networks.
- Avoid enormous network payloads , which identifies areas for improvement by calling out large library downloads (which can cause huge network payloads).
- Setting the right caching durations