I'm really not sure why a lot of people are having issues and I hope they are solved soon for you guys. Once you get stuck in, it's a truly brilliant game! And bloody gorgeous.
Here are my benchmark results and settings. My rig:
Asus ROG PG279Q 1440p 144hz IPS (gsync enabled)
i7 8700k @ 4.8Ghz (all cores) - Kraken X62 and it's delid
32gb Corsair Vengeance Pro 3200mhz (XMP ii)
Asus Z390-E
EVGA 2080 ti XC Ultra - OC'd core to 2,100 mhz, memory at 8,000 mhz
Asus Zonar STX ii Sound Card
1TB Samsung 970 Evo m.2 SSD (I've other normal SSD's, no mechanicals, but the game is installed on the m.2)
Here are my options and results: