Game is running at about half speed. It ran fine before this shift/tab UI was introduced but I haven't played for long enough that I can be certain that's what did it.

What's really bugging me is that I can't seem to find an exe file that doesn't run GoG's community layer with FTL but shutting the GoG stuff down in task manager didn't make a difference and trying to restart the game without it just restarts the "service."

This is on a 2017 Razer Blade. Not exactly on the fringes of FTL's minimum spec.