Intellimouse Optical momentarily freezes from time to time

My Microsoft Intellimouse freezes for brief moments from time to time. Sometimes it totally freezes and I have to reconnect to make it operable. I have repaired permissions and ran MacJanitor. It is usually less of a problem after this, but gets worse in time. Any suggestions as to a permanent solution.
eMac   Mac OS X (10.3.9)   G4

bossless,
Welcome to the Apple Discussions!
Do you use any drive software for the Intellimouse or do you use it as a generic three-button mouse? Support for three-button mice is built into OS X --- your mouse should work out-of-the-box without additional software.
The most common reason for an optical mouse to momentarily freeze, or to appear to jump from one spot to another, is actually refelction problems with the mousing surface. The mousing surface needs to be reflective, but not too reflective. Also, crud can build up underneath a mpouse; try cleaning the bottom of the mouse, especially the LED opening. Also try using a sheet of heavyweight bond paper as a mouse pad and see if the mouse behavior improves. I've had good behavior for some time now using floor tiles as mouse pads (following up on a suggestion from Ron Jackle); a dull matte finish tile works well. A bright while tile is too reflective, but a tan 8x10 floor tile, tagged 8x10-5202 at Home Depot, costs about US$0.89 and will last effectively forever.
The second leading cuase of jumpy mouse behavior is internal wire fraying in the mouse cord, especially where the cord enters the mouse body. If possible, try your mouse on a different computer; if the freezing continues, you know it's time to replace the mouse.
A final thing to check: do you often have many CPU-intensive tasks running at the same time? You may simply be overloading the computer. I use MenuMeters for real-time monitoring of the CPU load. You can also use Activity Monitor or the like. If you notice the mouse freezing correlates to CPU usage closing in on 100%, you'll at least know why.

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