I previously owned an Intel Core 2 Duo 24" iMac and upgraded to the iMac i5 in April 2010. Ever since upgrading, I have not been all that impressed with the speed and response of the i5. I am pretty certain my previous Core 2 Duo was faster at processing. My sister just bought a new 13" Macbook Pro 2.4 Ghz and when I played around with that, it was very responsive. It seems like if I have two programs open at once (not even RAM intensive programs), the i5 is almost at a crawl with lots of waiting and beach balls. I have repaired permissions and verified the disk and that checks out fine. Is there a program or an internet test I could use to benchmark the i5 to verify whether it is functioning as it should? Any other suggestions? Thanks.