A resync of Donkey Kong Country 2 any% to 2.9.1, automated using an script. From https://tasvideos.org/4048M
Emulation differences reduced the final time by -00:03.75 (-247 fewer lag frames, and 23 extra lag frames)
Note (19 July 2023): GBAHawk is probably now a more accurate option than BizHawk 2.9.1, and I suspect there are probably around 30-60 seconds more lag on it to match more accurately with real console.
Note (4 October 2023): I recently did a resync showing that GBAHawk does indeed have notably more lag than mGBA. It wasn't quite as significant as I initially proposed, though. It had 6.898 seconds of additional lag.