Now when you refresh a page, instead of downloading all of a website’s resources again, the web server instead checks what your device already has. and it’s the reason that refreshing a page is faster than accessing it for the first time.
Chrome software engineer Takashi Toyoshima wrote on the Chromium blog that this new behavior maximizes the reuse of cached resources and results in lower latency, power consumption, and data usage.”
However, this is not going to improve the speed when you load the the page for the first time but improve the speed than previous when you load an previously opened page. Read completely here on how exactly Facebook, Chrome and Firefox implemented them.
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