Thank you for your feedback and I'm sorry for our slow response. You can disable/enable JustCode from Visual Studio Tools menu - choose Add-in Manager. It will open a dialog window which has JustCode row with two checkboxes. The first checkbox just in front of JustCode name enables/disables it for the current Visual Studio session, the second which is in Startup column enables/disables JustCode even after restart of Visual Studio, i.e. in any session. Unfortunately there is no other automatic way of turning JustCode off for specific projects. Hope this works for you.
Also we are constantly trying to fix performance issues like the one you mention and will greatly appreciate if you can send us some more feedback about the performance problems you encounter.
the Telerik team
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