feat request: display of frame duration

[trusktr]

Hello! Love this project.

It could help with benchmarking the engines having a number other than FPS, such as the duration of each frame. For example, even if the FPS is 60 on a display with 60hz, the frames duration might be 4ms, 8ms, or 10ms, all without affecting the FPS, so seeing the number will be useful.

[lo-th]

yes good idea i will add in next update

[lo-th]

ok is add you can use phy.getMs() to return frame time