Well, it's already a recipe for silly forum questions, I guess "FPES" is no better/worse than "Internal FPS".  I'm worried if it has FPS in its name, users will basically expect that it means FPS, and have the same confusion they have now.

Another option is changing it to actually be frames per wallclock second, but that's less useful from a debugging perspective.

So, I guess I'll just change it to internal FPS, it's unfortunately going to be confusing no matter what.

-[Unknown]