Until the GPU driver _says_ it has finished rendering. Been developing WebGL for years. I've never seen any difference in performance with gl.finish() and with

Until the GPU driver _says_ it has finished rendering. Been developing WebGL for years. I've never seen any difference in performance with gl.finish() and without vsync. I would expect some difference because the JS code wouldn't be running in parallel with gl.finish(). The only way I have been able to measure performance is to look at the FPS without vsync (chrome --disable-gpu-vsync).