Scroll lag/high scroll latency (not slow or jerky) MacBook White Early 2009 (MacBook 5,2)

I'm having a strange problem that's not easy to explain. It will probably take one or two reads!
I have two Macs, one has the problem, the other does not:
2009 MacBook White 2GHz Core 2 Duo - 8GB 667MHz DDR2 SDRAM - NVIDIA 9400M 256MB Dedicated - OS X Lion (HAS PROBLEM)
2009 Mac Mini 2GHz Core 2 Duo - 2GB 667MHz DDR2 SDRAM - Intel GMA 950 64MB Shared - OS X Lion (DOES NOT HAVE PROBLEM)
The problem is with scrolling with a mouse wheel or trackpad in various apps, iTunes in Album List display mode is the example I'll use.
I have the same iTunes library with around 4,500 tracks on BOTH Macs.
When I scroll the list initially everything is fine but with repeated consecutive scrolling actions either in the same direction or alternating (with any mouse wheel, magic mouse, built in trackpad or magic trackpad) the response slowly gets further and further behind the physical action to the point where I will stop the physical scrolling action and iTunes continues to scroll mimicing my previous actions (including any slowing, speeding up and direction changes) for 5 seconds or more until it catches up. It's NOT jerky, it just starts to lag behind.
The strange thing is that if I open another app (like Terminal), move it completely out of the way so that the entire iTunes window is visible but the other window still has focus and then scroll the iTunes window without it in focus there is no delay at all and the responses map the physical scroll actions 1 to 1.
I did have MagicPrefs installed but have uninstalled it. I've tried shutting all apps asside from iTunes and it makes no difference. I've tried an SMC reset, no joy. There are no repeating messages in console.
Any ideas? It's bugging me a lot.
Thanks!
Marc Roberts

Compare what's going on in Activity monitor (Applications > Utilities > Activity.monitor.app) when you are getting the delay and when you scroll withoud delay with a different input window selected.
Do the same with your mac that doesn't have the problem, and see if there's any obvious differences. Post back here any processes that are consuming a lot of CPU time, and the page in/outs/swaps.

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I have the same problem as this person had with iSight. It happened 2 times, once in December 09 and once Feb 2010. Both times I was told to reset the SMC and the procedure worked. But I would like your opinion whether something insidiously wrong with the SMC or other hardwares in my MacBook 13-inch alum late 2008 model. Or do I need to re-install the OS, which I upgraded it from 10.5 to Snow leopard (10.6) back in Sept. 2009. Thanks.
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