Here's a video: https://drive.google.com/file/d/1MTnT0YuDbGZrQ0riAKHIoSnmyZPwk7DX/view?usp=sharing It's from a Moto G5. The video is pretty representative of what it looks like on device. Chrome is smooth (though drops an occasional frame) and it's really slow on fenix. This is 2021-09-27 Nightly.
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~~Here's a video: https://drive.google.com/file/d/1MTnT0YuDbGZrQ0riAKHIoSnmyZPwk7DX/view?usp=sharing~~ _edit: I waited a longer delay after clearing data to ensure the WebRender shaders were compiled: https://drive.google.com/file/d/11VPnxrNYjmOYIWZIb8En7LSOQby7mJMf/view?usp=sharing_ It's slightly better but still not great compared to Chrome. It's from a Moto G5. The video is pretty representative of what it looks like on device. Chrome is smooth (though drops an occasional frame) and it's really slow on fenix. This is 2021-09-27 Nightly.