Very slow response when selecting in Illustrator CS5 Mac

I am using Illustrator CS5 (15.0.1) on my brand new MacBook Pro with Core i5 processor and 8Gb Ram.

On this machine, Illustrator should behave very good, but when I do a selection of anything in an almost empty document, I get a beachball and have to wait a couple of seconds getting Illustrator to be responsive again.

This is very annoying.

This happens on anything I select (path, text, rectangle,...).

I have reinstalled the whole CS5 suite, but still the same problem.

Anyone got the same problem and know how to fix this.