Unhappy Android on Kaiser really slow?!

Hi, I tried both the latest Myn's Warm Donut and DZO builds on my Kaiser. Both work, but both are really slow. Does anyone have the same experience or know a way to speed things up?

BTW: I am booting from SD, using Haret. Is there a mayor speed difference with NAND? I am reluctant to install to NAND if that doesn't change much.