You probably have v-sync on for OpenGL.

Argh I did 🙁

Thanks heaps!

I set it in the Nvidia driver for the DOSBox executable a while ago.

Ok deleted the profile and now works under opengl mode!

Also I noticed I get the same issue when using "Double Buffering" when in ddraw mode (but double buffering worked fine in opengl mode).

Is it possible that double buffering uses Vsync when in ddraw mode (but not in openglmode?)

Having more luck with Camtasia.

Though I need to crop the video as it captures the window outline as well. Still the only tool so far that allowed me to capture the PQ3 intro with MT-32 sound without any slowdowns...