When I run games that require you to have a CD in the drive, the game is skippy. Like X-Com 3 or CyberJudas. I have messed around with the core, and CD emulation, I've also changed the CPU cycles and frame skipping. The games still have speed issues when accessing, I've also enabled IO Control on all of the drives in DosBox. Nothing seems to work, and my Athlon XP 2200+ should be fast enough. The speed doesn't seem to depend on which CD-ROM I'm using either.