You might also want to remember that the Kobo Forma and Aura One with eMMC storage have similar performance to the Clara HD, etc. which use uSD storage. This despite the data sheet for the eMMC showing better performance specs -- 37MBs read, 120MBs write compared to a Sandisk class 10 SD card with it's minimum 10MBs. Individual cards do vary wildly in their speed -- I bought one 3 pack of Sandisk uSD cards and the read speed went from 20MBs to 30Mbs. Using a UHS card will not help since near as I can tell the Kobo ereaders do not support the UHS bus so will fall back to the standard SD bus.
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