CS3 macbook pro

Hey there, I have a macbook pro with 2gb ram, 2ghz core duo, and when I run the new photoshop cs3 it takes quite a while to work. Say I erase an area in a photograph, there is a definate lag while the system does its' thing. This can be anything from 10 - 60 seconds. I am a recent switcher from PC as I was given a MBP as part of a university award, and my old 2.4gz P4 runs photoshop faster and never freezes. This is my first laptop, should I exspect reduced performance?

Try running this speedtest:http://www.retouchartists.com/pages/speedtest.html

It took 7mins 2secs on my P4 3.0Ghz. What kind of time do you get on your Mac?

RE: speedtests

Thanks for the info Alexis, here are my results

Pentium 4 @ 2.4ghz/1gb ram/FX 5200 256mb, windows XP pro, PS CS3, test completed in 5m18seconds
MacBook Pro 2ghz/2gb ram, PS CS3, test completed in 1m26 seconds

Hmmm wonder whats going on then ?

That sounds a strange one. What programs do you have open in Activity Monitor? What widgets are you using as well?

My MB is 2GHz, 1GB RAM, and runs PS CS3. Nothing goes wrong, and I run it with Safari and Yahoo! Messenger. And sometimes even with iTunes, but it doesn't lag.