I don't know if it's really a bug, but "Strikers 1945 Plus" got a lot of slowdown with current fba (on my i7 with standalone fbalpha, not on my raspberry with libretro-fbalpha ). I heard it was a lot smoother with the 0.2.97.37 release (i didn't test it myself though, but it was mentioned by the guy who reported this to me on github), so it could be a regression.
I don't know if in the previous FBAs Strikers 1945 Plus was smoother, but the slowdowns are present with the full emulation speed (all frames rendered, 59,18 fps), so, probably, the slowdowns are intrinsic of the original hardware (I never played with the real cabinet, so I can't be sure).
PS: the S1945Plus (original hardware) is based on the Neo Geo MVS, so also your raspberry Pi should emulate it without problems...