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Most proxies, most notably Squid up through version 3.0, do not cache resources with a "?" in their URL even if a Cache-control: public header is present in the response. To enable proxy caching for these resources, remove query strings from references to static resources, and instead encode the parameters into the file names themselves.
Moving inline style blocks and <link> elements from the document body to the document head improves rendering performance.
Correctly ordering external stylesheets and external and inline scripts enables better parallelization of downloads and speeds up browser rendering time.
Fetching resources asynchronously prevents those resources from blocking the page load.
Properly formatting and compressing images can save many bytes of data.