antonioconte,
What kind of machine are you on?
Obviously this is not a normal behaviour of OSX.
How did you install OSX 10.2 on your system?
- Was it an upgrade from 10.1.5?
- Was it a clean install?
I hate to suggest this but at my office we've seen a lot of issues with the upgrade. Almost all of the machines we did an upgrade on have later been forced to do a clean install.
Sometime this is not an option or possibly a major inconvenience, but it might be the only way.
Before you do a clean install, check your normal things...
Disk
Use a disk utility app to check for a fragmented disk, etc...
System
- See what you're finder is doing... type "top" in the terminal to see if it's draining system resources.
- Try creating another 'test' user and see if that account has similar problems. If it doesn't then you can isolate the issue to something in your user folder. (ie. a conflicting driver, font, or finder preference issue.)
My guess is that you're going to find more of a broader problem that is going to require a reinstallation.
