Yeah the clunky behavior/slowdown is in the preview window, not the text editor.
I just did some testing:
With GPU acceleration
enabled, Preview window renders at ~60 FPS, with maybe 10ms latency.
With GPU acceleration
disabled, Preview window renders at ~21 FPS, with ~100ms latency.
Interestingly, 100ms of latency is about the point where feelings of "sluggishness", "discomfort" and "nausea" can start to kick in, in a major way, at least in academic research done into computational/interactive environments (
https://www.frontiersin.org/journals...20.582204/full)
I guess this is why I intuitively switched it off.
I have another computer with a 1080 installed, 8GB VRAM, also AMD. I'll replicate my tests later today.