Anyone running Quantum on Linux with a 4k monitor? I switched from Chrome for a couple months but the lag/jank/choppiness (especially when scrolling) finally drove me back to Chrome. Still loving the new FF on my HD screens though.
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If you aren't setting layers.acceleration.force-enabled to true in about:config, Linux GFX performance is pretty bad. Its a night and day difference for me, and I haven't personally had any issues with it (I use relatively up to date kernels and Mesa on a variety of Intel GPUs, YMMV).
I was going to say that my Firefox on Fedora 27 works really well, but now I realize I did set that force-enabled setting. I have no idea how it works without acceleration.
I've been running it on a 4K screen for a bit, since I've been using the beta channel, and it's seems to work very smoothly. At least, I have noticed the lag or choppiness you've mentioned. One caveat is that my screen runs at 60 hz, so if you have a higher frame rate, then you might see things I won't catch.