Long story short I have a PDF file which is quite large (7.17 MB). When I view it on my iPod Touch 4 it lags quite badly and often takes 5-10 seconds to move or zoom when I swipe. So my question is if I buy an iPad 1 will it be much better or will it still lag (same ram, is the iPad processor faster than the touch?) and also how much of a difference would an iPad 2 be over an iPad 1? Also I'm currently using the free USB Disk app to view the file, is there a better app that would be much faster to load it? Thanks.