When you encounter the performance issue, please take multiple stacktraces at some intervals, and email them to us as (at firstname.lastname@example.org). The instructions at http://blogs.adobe.com/cfbuilder/2009/12/reporting_one-off_issues_with.html would help you to do that.
Also, can you check couple of things and tell us so that we can analyze the issue effectively?
1. Just re-confirming, does it all work fine when syntax checking is turned off?
2. If your project is associated with a server (local or remote), make sure it is running and then see if you still get the freeze.
3. Does it occur in any particular file/code? If yes, please email us the sample code/file.
Adobe ColdFusion Team
bill (at) brainbox.tv
I'll do the stack dumps now.