I tried searching around to see if anyone had experienced this problem before and came up with nothing, so I apologize beforehand if I've somehow missed it...

The issue I'm having is that whenever I play some of the old apogee/3drealms games (commander keen, biomenace, blake stone, etc) and go to fullscreen mode, dosbox slows down to a CRAWL. As in, takes forever just to render a menu screen... I've tried changing around various options with no success. It's awfully strange, because I never have this problem with any other games.

Ideas? : \