Algodoo

It is a device to reduce lag in your scenes, by changing sim.frequency.
It can be used sometimes (sometimes, because it sets fps to 50 when frequency is 100) as FPS measuring unit.

INSTRUCTIONS:
1) Download scene
2) Put it in the phunlets folder
3) Declare scene.my.fps = 50 in your scene
4) Import phunlet
5) Be happy

P.S.
It was Kutis's idea to make such kind of thing, but method and realization are mine.