Why did my Nexus 7 1st generation get incredibly slow after the update?

I managed to delete a lot of videos that take up a lot of memory but it is still slow, to a point that I can't use it anymore. It hangs all the time. All apps crashes. Screen is unresponsive. It's frustrating.

Any tips and tricks to make it work? How to undo the update (if it's possible)?

I tried task killers, power button+volume down long press. Nothing works, so far.

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