Ive had similar issues but mainly due to mods, although one issue i notice is that when the game needs for your gpu and cpu to be used more it doesn't, resulting in stuttering. You usually see this happening with things loading in or mods trying to find prefabs for spawns. It was driving me crazy until i editing my boot.config and slightly overclocked my gpu. If anyone wants to try this out: go to your boot.config located in "C:\Program Files (x86)\Steam\steamapps\common\Valheim\valheim_Data\boot.config" and add
gfx-enable-gfx-jobs=1
gfx-enable-native-gfx-jobs=
should look like this
"gfx-enable-gfx-jobs=1
gfx-enable-native-gfx-jobs=1
wait-for-native-debugger=0
hdr-display-enabled=0
gc-max-time-slice=3"
This helps if you have a higher end pc like i do, valheim doesn't use your full gpu and cpu, especially during loading new territory and spawns. Also another tip would be setting vertical sync in your nvidia control panel to "fast." But yeah, this is extremely helpful for those people out there that use epic valheim, or just mods in general, and get ♥♥♥♥ performance. Also i would recommend installing NZXT cam to check your gpu usage and cpu usage