im using a regular microsd card and my pics load fast...how many pics do you have in that folder though??? i have about 150....maybe if you have a lot more it could be slowing down a bit..not sure, sry
It could also be the picture size in the files. Did you take them using an uber megapixel camera? If you did, then adjusting the pixel resolution in the file properties will help greatly in the speed the Tour handles the pictures.