Snow Leopard is the first time I have regretted owning a Mac.
The system slows down to a crawl, requiring reboots for every few hours of use. Tiger and Leopard would run for months without a reboot. I have spent hours online researching tweaks and fixes, with very little improvement in performance or stability. If I wanted to fight my computer instead of use it, I would have stayed with a PC.
Ironic that Windows is now MORE stable than OS X.
Some people here don't seem to have any problems with SL. You are lucky. This forum and every other forum online demonstrates widespread continuing problems with SL.
Maybe some of you have got hardware problems. My buddy just had to swap the harddrive in his imac due to spinning beachballs and errors like stalling when launching apps (safari and ichat would take forever to launch). The apple hardware test found an HDD error, and like I was saying - everything is back to rock solid after the swap.