An FBNeo dev confirmed to me that the CPS3 speed they use is 59.59949Hz, this doesn't work with Fightcade 2's emulator, I also tried it with an official FBNeo build (fightcade 2 apparently illegally uses a branched version) and it appeared to have worked, I then intentionally picked an off-spec refresh of 60.000000Hz expecting tearing and it was also fine (thus showing there might be some sort of V-Sync going on). Despite all the V-Sync, and Triple buffering etc being set to off there appears to be something going on with the official build