I made a few retropie raspberrys with the B model with the big SD cards and everything ran pretty smooth with no overclock (nes,snes). I recently ordered a b+ model and popped a 128gb microSD card in that bad boy and I am seeing a decreased speed in ROMs. This speed decrease is dramatic, losing almost 35 FPS on every game, games like mega man 3 or SMB3 making them unplayable with default installation.
I am thinking that this may either be related to the b+ itself compared to the B, or to the microSD, or possibly to the size of my microSD as it is as large as they come.
Has anyone else experienced this or noticed decrease in larger GB SD cards? I wonder if putting everything except for the boot partition on a USB stick will give me a better output.