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If you export and reimport models and/ or model stores from e. g. a customer's dev environment into customer's live environment and then the AX 2012 client opens very slowly in many forms and the compiler output window popped up although no development workspace was in use at that time then check the following:

Go through all forms of type “ListPage” where you might have created customizations. Check for any existing customized methods and remove the customizations from there so that Standard methods only are kept.