Mac OS X as we all know, like many operating systems. Uses a swap file (Page file for you winblows users) to store inactive files or when it runs out of RAM. This can slow you down if you have a lot of windows open or do a lot of editing. Now this fix only works if you have 4GB or more of RAM. As we are going to disable this feature. It's very simple, open up terminal. In aplications -> Utilities. I have it in my dashboard as I use it a lot. I'm used to it as I am a linux user.
Then type:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist



Then to undo it, simply where it says unload type load.