Significant performance loss on Polaris GPUs after 1.0 update

Hey there,

It appears the Polaris GPU line have possibly suffered an extreme performance loss after update 1.0. While others GPU lines may be affected, it appears I am not the only one with a Polaris GPU (in my case an RX 580) while some other GPUs aren't seemingly affected (my friend on an older GTX 970 haven't noticed anything). I am not talking about a few frames lost, but up to 50% performance loss in the worst scenarios (30FPS instead of 60). There is also very repeatable scenarios where FPS used to be at 60 with headroom (like end of game screens, certain maps area etc..). Reinstalling drivers did not help, deleting the shaders cache did not help either, using a new settings file did not help.

Thank you

EDIT: Added my full specs

Ryzen 5 3600 at 4.2

RX 580 4GB

Ballistix 16GB 3200Mhz

ASUS ROG STRIX B450-F Gaming II

Latest version of Windows 10 x64

Game on an SSD

EDIT 2: I'm adding a short video showing what kind of performance I'm getting. The scenario shown in the video used to yield 60FPS easily with room to spare, now I have half the framerate. This is repeatable in a lot of places. I should add I usually play with the static render scale set to 0.90, but this is with 0.85 which usually gives about 5-8% FPS gains, but it doesn't even help here.