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If you haven't seen this example from Niall O'Donovan on script events you might want to explore take a look at it. It shows what events fire when and implications for form performance.
http://www.assuredynamics.com/index.php/portfolio/livecycle-designer-es2-script-events/
I'd say though that something is causing Acrobat to work hard which is where the spinning wheel is coming from. I don't know why that would change between version 9 and 10 though.