It's unbelievable, i've tested Painter 11 with the new Snow Leopard, it's amazingly fast. When you click painter on the dock, it didn't bounce, painter 11 flash screen flash, then loads the application instantly. That's how amazingly fast the new OS is. I've tested it a bit for 2 hours, draw and paint with my intuos4. I didn't saw it crash I'm happy to upgrade to the latest OS!!!