How Baldur's Gate 3 runs on the Radeon RX 580
Our estimate puts the Radeon RX 580 at about 29 fps on High at 1080p in Baldur's Gate 3, which means it runs only on reduced settings. On Low the same card manages about 56 fps, and on Ultra about 21.
The graphics card is the limit here, so lowering the resolution or the quality preset is what raises your frame rate.
For a steady 60 fps, our estimate says: 1080p: under 60 fps at every preset, best is 56 fps on Low; 1440p: under 60 fps at every preset, best is 40 fps on Low; 4K: under 60 fps at every preset, best is 22 fps on Low.