You know those times when Textmate beachballs for about 5 seconds when it regains focus, it’s generally caused by the fact you’ve got about 16 million folders in your public/system folder used by paperclip.
Here’s a quick tip to speed things up by ignoring those folders:
Open Textmate Preferences and goto the Advanced section. Then click on Folder References.

And enter the following in Folder Pattern:
!.*/(\.[^/]*|**log|system**|CVS|_darcs|_MTN|\{arch\}|blib|.*~\.nib|.*\.(framework|app|pbproj|pbxproj|xcode(proj)?|bundle))$
Rejoice in the fact that Textmate doesn’t make you want to cry.
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