native runtime: MiniFB runs slow
I noticed that when playing music on the native runtime on Windows, it was much slower than on web or on my linux laptop. Did a quick BPM tap and saw that it was almost 20% slower.

I added basic FPS calculation to the MiniFB update loop and it's hovering in the range of 51-53 fps (on my computer), despite the FPS target being set to 60. Raising the MiniFB target FPS (via `mfb_set_target_fps`) to 62 gets it to land at around 60, so it's definitely not a performance issue.

I'd assume a contributing factor is my monitor refresh-rate is 144hz (which is indivisible by 60), but I haven't looked into details yet.