Type about
:config in the adress bar. Then , look for network.http.pipelining and set the value at "true"
Then go to network.http.proxy.pipelining and low the value.
Look at nglayout.initialpaint.delay. If there isn't such an option, right click, then new>integer. Type the name as nglayout.initialpaint.delay and give it the value 0. As default, the value is 250 (milliseconds)
