Juliean said:
Wait, so are you saying that your old code was compiled in debug mode, and this new 160-FPS is in release? That would just about make sense.

yes @juliean

I see. In general you should not profile in debug unless you are having issues actually debugging your project due to abyssmal framerate. Release is magnitudes faster, usually. However that also means in your case that you are being (at least also) CPU-limited, as being GPU-limited would mean the difference between debug and release would be much lower. So you should profile the CPU-side of your application as well as the GPU-side.