Default What allocations unit size should I use

Hi I love putting all of my photos taken with my dslr into my Sony tablet z to show my clients. However I find that I always have to wait for a second or two for photos to be fully loaded which is quite frustrating. I'm already using a Samsung MicroSD Pro which is top of the line and formatted my card to exfat but I do not see any significant difference compared to a slower card.

I was thinking if my choice of allocation unit size might have an influence on the performance. I'm currently on 8192 and most of my photos are 10-15 MB jpegs.

Please advise.

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