
Then type this to filter field (network.http) then click this three line
1. Set (network.http.pipelining) to (true)
2. Set (network.http.proxy.pipelining) to (true)
3. Set (network.http.pipelining.maxrequests) number like 30. This will allow it to make 30 requests at once.

Then right-click anywhere and select New-> Integer

Name it (nglayout.initialpaint.delay)

set its value to (0). This value is the amount of time the browser waits before it acts on information it receives.

Close your browser & start again.This will help you to speed up your browser.

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