Games Moving Slower In 2 Player

[thegoffather2]

Hi
I am fairly new to this. I have a Raspberry pi3 that I bought as a bundle from a seller on eBay (They also have their own website).
It came with Sony PS3 Wireless Controllers, a standard UK 2.5A 5.1V power supply and an ultra fast micro SDHC card UHS-I high performance card.
I have been using the system fine and loving playing retro games for a couple of weeks. However I had my brother over earlier and we played a few games 2 player. The games were moving a lot slower than usual when we were jointly playing, as soon as one of us was eliminated from the game the speed would pick back up to normal again, if the 2nd player re-entered the game it would run slower again. Any ideas or advice as to why this is happening or how I could overcome it would be greatly appreciated.
Kind Regards

[mitu]

Please post the information asked in https://retropie.org.uk/forum/topic/3/read-this-first

[pjft]

@thegoffather2 it does happen on some games as it occurred in the original hardware. It certainly shouldn't happen in all games. What games are you referring to? I had that with double dragon on MAME, but after reading up on it it seems to be normal?

[thegoffather2]

@pjft Hi thanks, yeah DD was one of them and a couple of other Arcade. No worries, maybe its a common thing with particular titles then - Thanks