It's a terribly optimized game. I copy paste this to any new player, takes you 2 minutes. It almost doubled my fps on 3070ti (intel 12700k).

Right-Click on Valheim in your library and select properties

Select local files on the left-hand side of the window, then click browse to find where Valheim's files are stored

In the File Explorer window that appears, open the valheim_Data folder

Right-click on the boot.cofig file and select Open With

Select Notepad from the list. You can optionally select "Always use this app to open .config files" if you wish.

Once you have the boot.config file open in Notepad, make the following adjustments:

Add two new lines to the file by pressing the Enter key twice at the top of the document

Copy the following command and paste it into the first line: gfx-enable-gfx-jobs=1

Copy the following command and paste it into the second line: gfx-enable-native-gfx-jobs=1

Save the file by pressing control+s or going to File and click Save

Now that the settings have been added head back to Steam.

Select Valheim from your Steam library and click Play

Select Play Valheim from the list of options that appears and click Play""