I’ve noticed a really annoying problem regarding orbit controls that happens only on safari.
If you run this example on chrome it runs smoothly, but on safari moving the camera slowly results in the background image stuttering a lot.
I’ve also noticed that this example does work correctly just because it doesn’t use orbit controls.
I’ve lately tested with an iPad (8. generation) with iOS 14.7 several examples and could not detect a performance issue. There is also an issue filed at GitHub about performance problems with certain iOS devices. Maybe it’s related: