I had a quick go on the Anthem VIP demo last night. I only got one chance to load into the first mission due to the problems BioWare was having with the VIP Demo.
During the first mission, running at 1080p and Medium graphic settings, it was consistently running at 70fps. Alas I haven't had a chance to play more and get a better idea of the overall performance but i get the feeling that's its more taxing than Destiny 2.
My system: Late 2017 27" 5K iMac 4.2Ghz i7 7700K processor 16GB RAM Radeon Pro580 8GB Latest Windows 10 fully updated W7-x64-Crimson-ReLive-17.11.1
I haven't updated the Bootcampdrivers for quite awhile as Destiny 2 currently runs really well with these drivers so I'm reluctant to change things.