When I am writing long posts (say, larger than a screen), editing the post becomes increasingly hard because moving around the cursor has some significant latency: When I just hit the left/right arrow keys with 2-3 Hz, I can see that the cursor position on the screen often freezes for a second or two.
Similar for typing. Actually, typing is fine, just navigating the cursor around with the arrow keys is a problem. That’s quite bad for interactive text editing.
I can reproduce this easily by just writing a long post. E.g., I just copied the text from another Discourse instance to here, and the issue occurs on this instance as well. Short posts are fine though.
I did a brief run with the debugger tools, but they claim the framerate stays above 55fps all the time – so the problem doesn’t seem to be draw speed? Not sure what is going on, I do not have any web development experience.
This is using Firefox 62.0b15 on Linux.