In OS X Lion, when I hit the page up/down keys in browsers (Chrome, Safari), the page doesn't instantly jump as I'd like it to; instead, the page smoothly scrolls into position. I find that distracting. How can I disable it so that it jumps when I use the page up/down keys, I don't watch it scroll?
Lion and earlier versions of OS X have an option to disable smooth scrolling in the General or Appearance preference pane.
On Mountain Lion you can run
defaults write -g NSScrollAnimationEnabled -bool false. Applying changes requires reopening applications.