I used Spam Sieve for close to 30 days (still at 45% spam in training) and registered yesterday. Since registering, both Mail and iCal take up to 2 minutes to access (I get the spinning pizza). This is with both applications open. It happens when switching from another application to either Mail or iCal through Command-Tab, the Dock or clicking on a visible window.
This is happening on both a 1-GHz PowerBook and a 2GHz MacBook Pro running OS X 10.4.8. I wonder if anyone can advise?