Yep. This is the code that's causing it[1]: var now = Date.now()/1000; var dt = now - then; Adding this line fixes it: dt = dt > 1 ? 1 : dt; [1] https

Yep. This is the code that's causing it[1]: var now = Date.now()/1000; var dt = now - then; Adding this line fixes it: dt = dt > 1 ? 1 : dt; [1] https://github.com/grondilu/grondilu.github.io/blob/47d41d/pendulum-simple.js#L53 https://github.com/grondilu/grondilu.github.io/blob/47d41d/p...