Apparently, the game does something funny resulting in a loss of 10-20 FPS on AMD CPUs. To fix this, do the following :
(FULL CREDIT TO /u/ScarXLXX from PCMR IN REDDIT)
1. Download HxD hex editor.
2. Find your Cyberpunk2077.exe
3. Make a backup copy of this exe file just in case
4. Drag Cyberpunk2077.exe to HxD. A bunch of hex numbers will appear (like 01 FF 0D etc)
5. Press Ctrl+F, change column to Hex-Values
6. Type in "75 30 33 C9 B8 01 00 00 00 0F A2 8B C8 C1 F9 08" in the search string without the quotes (those values should appear highlighted)
7. Copy the following : "EB 30 33 C9 B8 01 00 00 00 0F A2 8B C8 C1 F9 08" without quotes.
8. Back in HxD, right click the highlighted values and select "paste insert".
9. Now go the top bar and click the save icon logo
A video guide for the above :
You can also do this to further improve FPS :
1. Find Cyberpunk2077.exe
2. Right click it, select Properties, then select Compatibility, then check "Turn off full screen optimization"
This is a fix you can do for most games running on Windows 10. Full screen optimization almost always tanks the framerate.
Also, the current state of the game (especially on consoles) is inexcusable. The game is a buggy mess, and they deliberately hid the actual footage of how the game runs on the PS4 and Xbox One from their users till release.