[jacobolus]

Safari on a new 13" MBP gets ~50 fps here on the Sponza demo and maxes out at 60 fps on the PBR demo, without any trouble, and with plenty of other stuff running on my laptop simultaneously.

Both seem to hang at load if I turn on Safari’s experimental support for WebGL 2.0 though, so that might be what was happening to kevinb7.