I have a bad habit of using the cursor keys of my keyboard to navigate source code. It\'s something I\'ve done for 15 years and this of course means that my navigating speed is
On Mac OS X, open the Global Preferences plist
open ~/Library/Preferences/.GlobalPreferences.plist
Then change the KeyRepeat field. Smaller numbers will speed up your cursor rate. The settings dialog will only set it to a minimum of 2, so if you go to 0 or 1, you'll get a faster cursor.
I had to reboot for this to take effect.