If you are wanting the page to display faster then this is right for you. But this will also increase the page loading time a bit since you are looking the page much sooner.

1) Open Firefox 3
2) Go to address bar (Type: about:config)
3) Right click
4) Select New
5) Select String
6) In blank (Type: nglayout.initialpaint.delay)
7) Hit Inter
8) In blank (Type: 0)

Recommended
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1) Right Click
2) Select New
3) Select String
4) In blank (Type: content.notify.interval)
5) Match the value to nglayout (0)
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You don’t have to preform the recommended step, although it is highly warranted that you do that step. This ought to increase the page display time, and in turn increase the overall load time. If you have any problems, leave a comment.

Via: cnettv