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user_pref("browser.cache.disk_cache_ssl", true);
user_pref("content.max.tokenizing.time", 2250000);
user_pref("content.notify.backoffcount", 5);
user_pref("content.notify.interval", 750000);
user_pref("content.notify.ontimer", true);
user_pref("content.switch.threshold", 750000);
user_pref("network.http.max-connections", 48);
user_pref("network.http.max-connections-per-server", 16);
user_pref("network.http.max-persistent-connections-per-proxy", 16);
user_pref("network.http.max-persistent-connections-per-server", 8);
user_pref("network.http.pipelining", true);
user_pref("network.http.pipelining.maxrequests", 8);
user_pref("network.http.proxy.pipelining", true);
user_pref("nglayout.initialpaint.delay", 750);
If these settings don't give you an improvement, you could play with the "content." and ".initialpaint.delay" settings. As said above, I got the best results by keeping them in synch as in the given example (750000 and 750) while setting "max.tokenizing.time" to a multiple of "switch.threshold" (greater 3; with the values of the above example: 3 * 750000 = 2250000, 4 * 750000 = 3000000, ...).
If you're not satisfied with a setting and want to reset it to the default, just remove the pref both from user.js and prefs.js while not having Firefox running.