I just tried this fix.
It seems to have worked! I'll report back in a week to report if it actually fixed the issue.
I was having this same problem too. I had to disable Syntax Checking in order for my installation of CFBuilder to run smoothly on my Macbook Pro.
Preferences ->Coldfusion -> Editor Profiles -> Editor -> Syntax Check -> Uncheck "Enable Syntax Checking"
Personally I don't like losing this feature because it is a very handy feature to have, but you can enable Syntax checks on file save instead as a workaround.
It's been a few weeks now since I've disabled the Firefox preview. It worked!
Thank you so much
No worries. I had firefox disabled on my installation of CFB and was still having perforamance issues which lead me to doing more research and finding that Syntax Check was the culprit.
Just wanted to share in case the performance issues resurfaced.