I don’t own the game, so sadly, I can’t test. But it’s weird, because according to the Dosbox compatibility page, it should work fine: https://www.dosbox.com/comp_list.php?showID=40&letter=M
Some speed issues on 15 years old PCs (Athlon XP 1800), but even an entry-level smartphone cpu is much faster than that.
Have you compared the performance to gameplay videos on Youtube? I’m asking, because maybe the slow gamespeed is just what the developers intended it to be (as annoying as that might be)?