I substituted the internal SD card of my Glo HD with a 16GB Sandisk Ultra (class 10) that I had lying around the house. I'm not an expert by any means, but the reader is definitely faster than it used to be (though it is true that it's not the kind of difference you'd notice while reading). I mostly notice it while processing new books into the database and in navigating the library (I have 3000+ kepubs on it and 50 pages of collections, so any small improvement is welcome).
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