It’s really not that bad.. Restoring as new pretty much solved every issue I had.
I did a dfu restore aswell (+set up as new phone) but the problems are there. Its not all about stability and performance, its about those small bugs you find literally EVERYWHERE in every corner. If its not crashing, its lagging. If its not lagging, its bugging and does not to what its supposed to do. Ios 11 is a android simulator, it seems that some holiday worker quality-checked this os.