frame rate

My RG280V (which has the same CPU as a 350) keeps slowing right down in XMame, e.g. Street Fighter 2, R-Type II and even Defender (!). NOTE: I bought it from AliExpress so suspect a low quality memory card is to blame -- or it could be just the XMAME emulator. I'm thinking of putting Emulation...

Hi all, Has anyone else experienced frame rate issues in games? Anything I play, be it an emulator or an Android game from the store, the screen seems to slow down and speed up. This is most noticeable on side scrolling or vertical games such as shooters or platform. The games seem to run ok...