Generally embedded browser is fine. But this one page locks up the whole app.
The app becomes unresponsive to input and consumes 100% CPU. It doesn’t hang the app but close. I can still close the app from Activity Monitor and it seem to exit normally after a while. I can click another item in the list and it takes hours but eventually that item is getting loaded in the browser.
However, this is the only such URL. I tried a few other pages that use WebGL and all seem fine. Not as performant as Frirefox or Safari but still decent and none lock up the app.