First of all, launch your Firefox. In the address bar enter: about:config

Right click and select: New -> Integer

Name the integer: nglayout.initialpaint.delay

Change the integers value to: 300

(time for browser to wait) or you can try setting it to 0

Second tweak:

Search for these keys

network.http.pipelining
network.http.proxy.pipelining
network.http.pipelining.maxrequests

Set “network.http.pipelining” to “true”

Set “network.http.proxy.pipelining” to “true”

Set “network.http.pipelining.maxrequests” to some number like 30. This means it will make 30 requests at once.

Lastly, restart Firefox as see the difference.

Enjoy the speed

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