Two things to do after upgrading:
- Upgrade your Flash player because the one that comes with Snow Leopard is old. It gets choppy with HD videos, for example.
Flash Player update and Snow Leopard
- Follow the instructions on this forum post to clean caches
UPDATE: I found out that the real problem was caused by extensions that weren’t compatible with Snow Leopard thus were giving errors and re-launching every few minutes (thus the beachballing). So open the Console and check your logs. When you identify the offending extensions from the Log, uninstall them if possible.
If you see launchd complaining that it can’t find something, a handy script called “Consultant’s Canary” may help you see where they are configured so you can go ahead and delete the launcher scripts.