adding these performance related tweaks (forgot where I found 'em) to my user.js file made the biggest speed performance boost for me - using firefox 2.0 btw
Code:
// Performance-related
user_pref("browser.cache.disk_cache_ssl", false);
user_pref("browser.cache.memory.capacity", 20000); // default: -1 (calculate dynamically); bug 105344
user_pref("browser.cache.memory.enable", true); // default: true
user_pref("browser.chrome.image_icons.max_size", 0); // default: 1024; max img dimension in either direction for which a thumbnail favicon will be created; bug 304561
user_pref("browser.sessionhistory.max_total_viewers",0); // default: -1 (calculate dynamically); bug 292965
user_pref("browser.sessionhistory.max_entries", 10); //default:25
user_pref("config.trim_on_minimize", true); // default: true
user_pref("content.interrupt.parsing", true); // default: true
user_pref("content.max.tokenizing.time", 750000); // default: 3 * notify.interval; bug 76722
user_pref("content.maxtextrun", 8191); // default: 8191; bugs 25509, 77540
user_pref("content.notify.backoffcount", 5); // default: -1 (never)
user_pref("content.notify.interval", 750000); // default: 120000; bug 72138
user_pref("content.notify.ontimer", true); // default: true
user_pref("content.switch.threshold", 750000); // default: 750000; bug 76722
user_pref("layout.reflow.async.duringDocLoad", true); // default: true
user_pref("layout.reflow.timeslice", 250000); // default: 1000000
user_pref("network.dns.disableIPv6", true); // default: false; bug 68796
user_pref("network.dnsCacheEntries", 50); // default: 20
user_pref("network.dnsCacheExpiration", 3600); // seconds; default: 60
user_pref("network.http.keep-alive.timeout", 60); // default: 300
user_pref("network.http.max-connections", 100);
user_pref("network.http.max-connections-per-server", 20);
user_pref("network.http.max-persistent-connections-per-proxy", 20);
user_pref("network.http.max-persistent-connections-per-server", 10);
user_pref("network.http.request.max-start-delay", 0); // default: 10
user_pref("network.http.pipelining", true);
user_pref("network.http.pipelining.maxrequests", 30);
user_pref("network.http.proxy.pipelining", true);
user_pref("network.http.redirection-limit", 5); // default: 20
user_pref("network.prefetch-next", false);
user_pref("nglayout.initialpaint.delay", 0); // default: 250
user_pref("network.http.sendRefererHeader", 0); // default 2
user_pref("viewmanager.do_doublebuffering", true); // default: true; bug 169483
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