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

[AC Question]

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.