Have figured out how to get a 10fps or so increase by disabling the First Officers panels, because who really uses those anyways.
You’re going to want to head to this location
MAKE A BACKUP BEFORE MAKING ANY CHANGES.
This is repeatable on the CRJ 550 as well.
Then open the “panel.cfg” file in notepad or notepad++
Then put some slashes next to these lines as shown below
Click save and then enjoy the FPS!
Let me know how much FPS you gained. I got around 10fps more.