What speeds do you get? and is the cardreader reading using SPI or faster modes? Switch reader, use faster card or try a usb-stick Also the PC and its running processes can have impact, some small and some big.
Normal datatransfers are faster? like movies, images? if so, then Xplorer is slow indeed. But I dont know in what kind of reader you are using and I never really paid attention to the speed of Xplorer360.
