This is with firefox (they also broke 3d acceleration in linux); chrome is OK, and so is firefox if I force enable video acceleration and ignore the severe visual artifacts.
FWIW, Chrome is still a bit sluggish on a 12 core xeon with no GPU, but it is usable (unlike Firefox on the same VM).
Anyway, I used to get away with no gpu acceleration on my laptop, but it became untenable in ~ dec 2016. It still sorta works on the server-side web browser.