I'm using a TTDS with Robz's forwards (I think this is his username, sorry if I messed it up D: ) and it seems like a lot of my games "lag" in the sense that they have longer loading times than retail cartridges and a lot of them don't run at full speed (such as AC:WW). They didn't work fully on my R4 either so I don't know what it is. I'm using a Class 10 uSD card and some version of YSMenu. Is it normal for games to lag like this or is it something wrong on my end, like the SD card?