If system lag then IGT can be inaccurate. (Video is an extreme case but 5%-10% usually happen. I'm bad at speedrunning so no submission)

1. Anyone test which minesweeper lag slow down game?
2. Do we edit time in this case?
3. If 2, then we're more RTA, and https://www.speedrun.com/minesweeper/thread/8p8tt

What version of minesweeper are you playing on?

Win xp. Mentioned in https://minesweepergame.com/minesweeper-cheats.php #09. Using 80386 and Win 3.1 should also be enough for such lag..

minesweepergame accept Arbiter plays but it also don't time correctly, and replaying makes mouse move fast

Arbiter should time correctly, as its timer is not supposed to be affected by lag. When you replay, you might have the issue of the mouse moving fast because you're dragging the sliding bar forward during the replay.