Lagging when in full screen edit mode

I get a progressive lag in typing responsiveness when in full screen edit mode.
This lag vanishes when I leave full screen, and appears again when I enter full screen mode.
Don’t know yet if this lagginess resets itself on a restart of the app.

Do you notice if this lag is happening in only a particular project, or with all your projects? If you only have one project, please try editing the Interactive Tutorial project (available from the Help menu) in full screen mode and see if you’re experiencing the lag there.

And just to clarify, you’re talking about making the application window full screen, right? Not Composition Mode?