General mobile android one extremely slow with Android 7.0. Anyone else experiencing this?

I've recently upgraded my General Mobile Android One to android 7.0, from android 6.0.1 Marshmallow. I've noticed that on Marshmallow, this device was quick, snappy, and happy to run anything I throw at it. Now, however, it is slow, sloppy, crashes a lot and things become a slideshow every now and then. Is there anyone experiencing this problem? What can I do? I know I can downgrade, but prefer not to.

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