if you want to help the team investigate the performance issues, please refer to this topic: How to Make a Performance Capture
as a short term help, altho it might not work for everyone, i changed some settings, and now mostly have stable 50-60is fps. sure, not optimal, but playable.
in options, try setting “Quality presets” to performance, test different Upscaling method settings, and play around a bit with other graphics options. For me it also helped turning motion blur off, and reducing render scale to 50%
also make sure to update your drivers (there was an nvidia update recently (i think a week ago or so), just in case you have not done that already.