I started with an already unlocked, but otherwise stock N7, 2012, Running the stock KitKat ROM.
I installed TWRP, used an auto-root method which booted an image via fastboot, and rooted. Then I booted back into KitKat, and installed Titanium Backup Pro to back up a few apps I didnt want to lose in the flash.
Then, i booted back to TWRP, and ran a system backup, so I could restore if needed.
Once the backup was done, I installed Paranoid 4.2 beta4, from their paranoidandroid.ca, and gapps from goo.im.
Booted paranoid android well enough, but man, it was sluggish. Really sluggish. It was painful to get my google aco**** logged in and then setup my email accounts. Thats about as far as I got before I decided that this was just not usable, and decided to drop back to my stock rooted backup.
Now, through all of this, I dont have a ton of storage space avaialble. The backup took up 4gb, and its only a 16gb tablet. I had a few hundred mb available after the backup, and install of paranoid.
After restoring my backup, things were still pretty darn slow. I cleaned up a decent amount of space, i have about 1.5gb available now. Its improved, but still sluggish. I'm not ready to delete the twrp backup yet, as i may try paranoid again, or maybe another rom, but I want to get tot he bottom of this speed problem first.
Does android depend on free /sdcard disk space in order to function well? Knowing what I know about linux this seems strange. Or is it that I should have wiped cache/dalvik when I restored my backup? I did wipe both, and /data when I did paranoid.