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OS X Tech Trivia

Okay, I’m really lost. I’m noticing on an iMac that after awhile it gets DOG slow. As in waiting tens of seconds for any response from the GUI after awhile. I’m completely baffled to why this happens. The Console Log tool shows nothing. When I ssh into the machine (lucky when that even works) and get a process listing I see -psn_0_blahblah tacked onto Finder based processes. Does anyone know what these mean? I’ve been googling around but can’t find a single instance of this anywhere. Doesn’t anyone else see these things? Here’s a snippet to show what I mean (emphasis added to show the -psn options):
401 ?? S 4:28.92 /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock -psn_0_393217
402 ?? S 0:36.82 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer -psn_0_524289
406 ?? S 12:35.89 /Applications/Virex 7/Virex 7.1.app/Contents/MacOS/Virex 7.1 -psn_0_917505
476 ?? S 0:03.14 /System/Library/Services/AppleSpell.service/Contents/MacOS/AppleSpell -psn_0_1441793

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