Originally Posted by len112:
“How old is your Nexus 7 ? Mine now runs so badly it's unusable . Not just slow , really unusable .”
Got mine for my birthday in January 2013. It has been fantastic up until 5.0. but then became exactly as you say. Slow, laggy and mostly completely unusable. Was really pleased when 5.1 turned up, but still had my concerns. However, the only time I see any sort of lag now is when booting from cold. Once fully loaded it's bang on and I'm really happy with it again.
I would say definitely give it a fresh wipe and restore. I did this a couple of weeks ago while still on 5.0 and while it made no difference with that version of Android, it
could make a massive difference for you. Especially if you have never done it for this tablet. They do accrue a lot of cruft that needs clearing.