DOSBOX hangs in 18.04

I’m running an old DOS game in DOSBOX in Budgie 18.04, and the game hangs, sputters, and doesn’t load properly or quickly. A Google search found that this was a Mutter problem, but I couldn’t find a way to fix it. Can I turn Mutter off? Can I edit Mutter the way I can with the XFCE compositor? Or am I stuck?

Thanks for your help.