How do you accidently remove the dashboard???????
Thats like accidently deleting the Windows folder... accidently fdisking the active drive or accidently backing into a large dump truck that happened to be parked at the end of your driveway and be dressed in your cap and gown trying not to be late for your own graduation....... OH wait I did do that one.
But I never deleted my dashboard. Why did you have to swap out the Hard Drive, couldn't you have regained the file by just popping in a Slayer's Boot Disk?
Don't know what would cause it to be slow... maybe its your HDs revenge