Retroarch / Flycast Dreamcast Performance issues in Launch Box

[McMeekan]

I can run Dreamcast games perfectly in either Retroarch or Flycast emulators alone but when I run those emulators within Launchbox the games slow down, noise crackles, and the games are generally unplayable.  game emulators work fine in Launchbox, even Retroarch with other cores (e.g. n64, Sega CD 32X, etc.) but specifically the issue is with Dreamcast games.  Any suggestions?

[midas]

When I had slowdown/noise crackling in Retroarch it was across all cores, and had to do with my resolution and refresh rate on the monitor. Other emulators worked fine. I'm wondering if you have an override in the Flycast core that has a different refresh rate than what your monitor is running at?