When a dynamic page is executing on the server, browser is doing nothing
but waiting for the html to come from the server. If your server-side
code takes 5 seconds to perform database operations on the server, then
for that 5 seconds, user is staring at a blank white screen. Why not
take this opportunity to download the Javascript and CSS on the browser
simultaneously? By the time server finishes doing its work, server will
just send the dynamic content and browser will be able to render it
right away. This optimization technique can improve the performance of
any dynamic page that takes some time to finish its job on the server,
and has some js and css to download.
Faster page rendering by downloading JS/CSS before server generates full page - CodeProject
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