1.Type “about:config” into the address bar and hit return. Scroll down and look for the following entries:

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

Normally
the browser will make one request to a web page at a time. When you
enable pipelining it will make several at once, which really speeds up
page loading.

2. Alter the entries as follows:

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.

3.
Lastly right-click anywhere and select New-> Integer. Name it
“nglayout.initialpaint.delay” and set its value to “0″. This value is
the amount of time the browser waits before it acts on information it
recieves.

If you’re using a broadband connection you’ll load pages MUCH faster now!

these were taken from here