Testing For Fps Drops

Questions
1

Hey everyone,
I was wondering is there a way to test performance for low end devices/test my code to see if it will be consistent over fps drops?

I thought i implemented a good way to keep gameplay smooth while some fps drop happend. However it seems it might not have gone as planned. Is there a way i could test different fps level to test that code.
eg test fps at 55fps, 50fps, 45. to 30 fps

Any ideas?

2

use setInterval() instead of engine.runRenderLoop()

This way you can render when you want for testing