Using Windows Vista, this was driving me crazy on both home and work computers. I thought it was because I wasn't using an adblocker, but then I tried a third computer using Chrome, no adblocker, no Norton Security Toolbar, and the difference was significant. No hangs every other webpage, no waiting waiting waiting.
So I went back to my home and work computer and disabled Norton Security Toolbar. No more hangs. I could Page Down, Page Up, go to Home and End without having to wait 5 or more seconds for a keystroke to register.
There are many webpages like this, but as an example:
http://www.howtogeek.com/73376/learn-even-more-windows-7-search-tricks-to-find-files-easier/
Go there and try to Page Down with NST enabled. Then when you (finally) get to the end, try hitting the Home button. Prepare to wait.
Then disable Norton Security Toolbar, restart Chrome, and try the same thing. The difference is significant with NST disabled, much more than it should be I think.