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It _is_ really weird, that didn't use to happen either. Started happening after some update of either Chrome or macOS, I'm not certain which.

In fact I think this is one of the most frustrating things of working with WebGL (or any of those slightly less common browser APIs, really), lots of small weird compatibility issues and instabilities.

Same here, Vivaldi is flickering and smooth. Safari works correctly at a noticeably lower frame rate.

I have found that Vivaldi uses the Macs Intel GPU, and Safari is CPU bound. WebGL 2.0 experimental support in Safari doesn't seem to have any effect.

My 2014's Intel graphics handles games newer than that without graphical artifacts... Unity games in particular are usually fine.

However, if you're already playing Morrowind (or OpenWM) then you don't really need anything else.

The same thing happens for me on my 2018 MBP, whether I turn on the discrete GPU or not.