hey thanks for your reply. that attached core was able to get maximum hangtime to run pretty good, by using an overclocked forwarder from wii u to vwii mode. it is 95% playable still has a few audio pops and glitches (64ms and 48000khz audio settings). i'm guessing that is the limits of the wii u, or possibly the results of using an older core?Midway games aren't playable in latest cores. You have to use a dedicated core or older ones:
https://gbatemp.net/threads/mame-2003-plus.499497/post-8483035
But, pretty sure this game won't run smoothly anyway.