I upgraded a MacBook Pro and a iMac to 10.8.3

I upgraded a MacBook Pro and a iMac to 10.8.3.

Formerly the MB Pro was on 10.8.2 and working like a charm. (Lion, not Mt. Lion.)

Now both machines are working ok, just really slow. It takes almost a minute to open mac applications, like mail and Safari. I feel like they are both running like my old dial-up internet connection years ago.

I am so distressed, because it looks like it will be a huge deal to downgrade to earlier version.

I have not tried the combo update since I was so disgusted by all the time I had wasted. Do you think it is still worth a try?

Thanks!