Using 1.0? If so:
Open Firefox 1.0 and in the address bar type: about:config
1. Find network.http.pipelining and double click on it so it = true
2. Find network.http.pipelining.maxrequests double click on it and change it from 4 to 100
This makes FF use 8 threads to each page.. Bascially, if you thought FF was fast before, try it after this.
and
Firefox is supposed to dynamically release memory from its RAM cache to other Windows applications as needed. Unfortunately, Firefox 1.0 seems to consume more memory than it should, which hurts performance, when set to the default of 51200 KB (51 MB).
To solve this:
Step 1. Type about:config into Firefox's Address Bar.
Step 2. Right-click any row, then click New, Integer. Type or paste the following preference name into the dialog box that appears (this is a hidden preference that doesn't exist in the Configuration Console until you create it):browser.cache.memory.capacity
Step 3. Click OK, then enter the following integer number into the next dialog box, representing 16 MB of RAM for the cache:16000
Step 4. Click OK to close the dialog box, then close all instances of Firefox and restart it.
Bam! Super fast, super efficient FF!