Following are a couple of things I've been advised to do should the computer slows down (which works for me). I'm still on Panther, though (10.3.9), so I don't know if this works just as well if you were using Tiger.
Forcing Periodic Maintenance May free some of your disk space and make logs easier to read over the time.
Open your Terminal and type :
sudo periodic daily
sudo periodic weekly
sudo periodic monthly
Press return between each line, and wait until the first command has completed to start the second one.
Updating the Prebinding This means forcing Mac OS X to go through all of the application files and make sure that they are correctly linked together.
To do this, simply open your Terminal and type:
sudo update_prebinding -root / -force
Then, enter return, type your password, and enter return again.
Once the command has exited, immediately reboot your computer.
Note: Do a backup first before you do the prebinding. I've never had issues, but I've heard of others whose computers completely freak after updating the prebinding.
Updated On: 8/2/06 at 12:02 AM