If your free space gets much below 3 GB the lag kicks in pretty bad. Free up more that 1 GB. Running a manual trim might help but be careful of bricking. Read the trim thread.
Sent from my BN NookHD+ using XDA Premium HD app
I am still on ...
Runing 10.1.3 on HD+
using USB Gender changer and 3rd party APKs a la Verygreen here are the results
Works with HD+ CM 10.1.3
HP V125W 16GB Flash Drive works - have 3 of em all work
Kingston Data Traveller G3 32 GB Flash Drive works