How big a library before degradation ????

I just wondered if there was a consensus to the size of an iphoto library before there was noticeable degradation in performance if the iPhoto application ?
I was running a library approximately in size with 15k photos on an older 2Ghz Macbook Core Duo. iPhoto bounced around 27 times before opening up.
We recently upgraded to a new Macbook Pro, 2.7Ghz i7.
Although opening up slightly faster, it is still pretty sow in scrolling though the photos, and generall feels a little sluggish.
I have actualy noticed a complete degradation since upgrading to iPhoto9. The previous version of iPhoto was nothing like this slow on the same library....
Any help/advise would be greatly appreciated.

iPhoto is good for 250,000 images, and so 15k is not a big library.
As a Test:
Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Create Library'
Import a few pics into this new, blank library. Is the Problem repeated there?
Regards
TD

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