I Downloaded it myself and have about 5-10fps in the main menu on a RTX3090 64GB , 3950X. Most of the reviews say the same. Colossal Order are suggesting you should play on very low detail. I was a massive fan of the original having played Sim City since 1993 but I cant even get into this. It shouldnt have been released so early IMO
Held off on buying it, although I have an itch, the weekly promo videos really made me want to play it. It's so sad, that it's in this state, this game deserves better. I want it to be good. I guess the only positive thing is that they gave a warning before hand, although they should have postponed it...