У вашего броузера проблема в совместимости с HTML5
This shows a test with 4000 static bodies and implemented frustum culling and another technique
It is NOT simulated via PC - it runs on my phone at 60 FPS
The player is not shown because of optical decisions.
Specs:
Sony XPeria Z3 - 1,5years old
recorded with phone recorder (inbuilt)