SD Cards can make a big difference. I had a class 8 32Gb sd card and Cyanogen on my Nook HD+ would run like a slideshow and crash/reboot often.
I bought a 16Gb class4 Kingston for £7 and it now works wonderfully. The only niggle is if I leave it in standby for more than a day it somehow reboots into the stock Nook OS.
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