I took a look inside the package contents, and it looks like the functional part of it is:
defaults write com.apple.Safari WebKitInitialTimedLayoutDelay 0.000001
You could simply type this into the terminal and completely skip the download/install. It does exactly the same thing.
To uninstall, simply type
defaults delete com.apple.Safari WebKitInitialTimedLayoutDelay
Edit: Holy Sh!t. This thing is Firefox-fast.
Really! Now I don't need to make the choice between beauty or speed. You're the Greatest Murray.