Glo Any performance difference using faster microsd card?

Hi. I have a Kobo Glo with firmware 3.1.1 using the standard 2 GB microsd card it came with, and no secondary microsd card. I'm generally pretty happy with the device, like the battery life and great screen for reading. Main niggle for me is inconsistent performance of device and some lost taps (next page or in word scramble game). Clearly the performance is limited by the CPU on this low power device, and dependent on the firmware from Kobo. However, I was wondering whether I might be able to make a quick win by replacing the microsd card: I believe that the internal microsd card is a Sandisk standard one, which will have pretty low performance I imagine. Whereas for a low cost I could replace it with a faster one such as the Sandisk Ultra.

Has anybody tried a faster microsd card to replace the original card and tested the difference, if any?

Thanks in advance