Yea, mouse rate only checks the polling rate for the mouse. Just toggle between the different polling rates and test them out via your joystick…it’s pretty noticeable between each setting.
Testing Update: Disabling Bi-linear filtering on Direct 3D also seems to reduce the delay slightly.
Ah…someone has been on the Arcadecontrols.com forums I see! I’ve been following the developments of groovyMame for the past few months. I definitely caught the post mentioning the “-frame_delay” option and it sounds very intriguing. I haven’t spent too much time with the emulator, so I don’t really know the optimal settings…I think it works best with Radeon graphic cards using the CRT_EMU and/or SwitchRes programs along with WinXP I believe. Hopefully the community can delve into this other Emu and compare results.