This tablet was super fast when I got it but now it lags and drives me nuts. I’d seen someone post on Reddit that flashing the factory image helped so I gave it a go.
Factory images are available here along with good, clear instructions. One caveat, Arch needs super user for fastboot otherwise you get “< Waiting for device >”. For the same reason run flash-all.sh with sudo too.
As to whether or not it helped, it is hard to say but I feel it has. How do you measure something that is entirely subjective?
Edit. Its been a few days now and it is faster. Much faster and without lag. I’m unclear why though. I’m not completely familiar with Android’s architecture but wonder if it’s a combination of multiple updates being applied (this was I think Android 5.0 when bought) and accumulated futz.