I've just come from an R4 to one of these DS-Ones in order to use SDHC cards. However, I find the gui a bit sluggish in comparison to the R4. For example, on the R4 when I go up and down on the games list it is pretty much instantaneous. On the DS-One there is a definite lag, even when I disable the file info window on the lower screen (the one showing the game's icon, full name, size etc). I've tried both FAT and FAT32 and also SDHC and also non-SDHC cards as well. I've also double checked and my DS-One is not a fake I am also running the latest OS as downloaded from the official site. Apparently there are tweaks that can be done to one of the ini files but I haven't found a source for this info yet. Can anyone help?