I was a Beta tester for S8!! Trust me, the official build is buggier than Beta versions. I was getting better performance on last Beta build.
On sending feedback to Samsung service team, I got a standard reply from them, of no use.
This final build seems to have following problems: 1) Battery drains insanely fast. Culprit seems to be Samsung Experience module. I have got 7 hours backup from 100% charged phone with 1 hour SOT. Refer attached screenshot.
2) RAM management is at its worst - The Samsung UX crashes multiple time in a day. Everytime I switch from an App to Home screen, the whole home screen loads folders one by one. I have been raising queries on same since Beta 1. But not resolved.
3) Freezing of phone - Have faced freezing of phone while multi tasking, typing a text - keyboard freezes, etc.
I didn't expect such performance from this kind of premium upmarket device. My HTC One M8 is still running lag free after 4 years of use. I know S8 is features loaded, still the RAM management needs a lot of work.
Hope we get a new update soon which resolves these issues..otherwise will have to downgrade to Naugat.