Many of its settings aren’t in the Options. Each hidden setting is stored as a string or integer in a file called prefs.js and is accessed by typing “about:config” in the navigation bar.
Computerworld provides instructions on 20 tweaks for speeding up page loads, making tabs behave, reducing memory drain, and generally making the interface act any way you want it to. Follow the instructions carefully. More …
Or get yourself a gigabit router.