Schroedingers-Hat/jsphys — comment on commit 1c01609f472d39c896fff4153398b603d7e3764f
File: relativity/js/scene.js line 208
By Schroedingers-Hat:

that sounds about right. Remember we can handle a few thousand points before geometry starts requiring similar resources to the drawing.
If it causes issues, one way to increase performance is to reduce the color cache. This results in less stroke() and fill() calls.