Countdown Timer for FPS
Countdown Timer for FPS
I mostly stuck with what I knew, but I checked its performance numbers against the built-in frame rate tracker in America's Army—they matched perfectly.
It needs to operate quietly in the background. You're referring to just recording data without capturing it locally. Afterburner and GPU utilization are the tools I rely on. An oscilloscope would be unnecessary, and connecting to the GPU for readings isn't practical. $$$