my friend and i have found that lag spikes when we interact or exit crafting stations around our base. we have even encountered severe lag spike when we encountered the bound enemy that duel wields sickles. when that enemy showed up the game became almost unplayable from the game freezing and lagging while fighting that specific enemy.
Can't confirm the combat lag issue but i have the same problem with workstations.
As far as i can tell it's not everytime i interact with them. Looks like it apears when i went to another world and come back to my base and only after playing at least half an hour.
On closing the crafting station the screen freezes for 1 to 3 seconds.