update -

i retired the 1600x1200 screen from 2007 (LP2065, which is the same panel as the 2007FP) and switched to my main 1080p monitor i use for the MiSTer - Acer Nitro XF243Y (https://www.rtings.com/monitor/reviews/acer/nitro-xf243y-pbmiiprx).

there wasnt anything wrong with the LP2065, but after doing a swap and test with my gaming monitor, it was apparent the monitor from 2007 doesnt hold up well in 2023. while very sharp and 4:3, the response time seemed sluggish compared to the Acer, almost like the LP2065 was on a slight video delay.

and the overall input lag experience was noticeable. the reported input lag of a LP2065 panel is ~16ms at 60hz

and the XF243Y is ~9ms at 60hz (see rtings review). while thats not too much of a difference in actual input lag, when combined with the almost instant response time of the XF243Y, the LP2065 just "feels" old.

also better colors on the Acer, and its an LED panel so it uses way less power and doesnt get hot. i am happy

Then I have no idea. I routinely use a keyboard - without a hotkey set - and don't experience the behavior you're describing.

@BobRossWins https://www.reddit.com/r/RetroArch/comments/c9csnr/game_latency_frames_wiki_runahead_wiki/