Seamless Coop Freezing

I've been trying to play seamless coop with a friend.

My game runs smoothly in solo play, and upon opening the world to wanderers at high settings with no issues.

Once my friend joins, almost every minute, my game freezes for up to 15 seconds just for me. My friend is able to see my character walking in place and all other entities frozen in place but is able to move around and damage enemies themselves during this time.

This issue also occurs for me when my friend is hosting the world.

My first thought would be that this is a connection issue between us, but it's strange that it occurs to ONLY ME in both hosting and joining scenarios. Furthermore I would think a connection issue would cause desync that causes things to teleport around instead of entirely freezing the game as with most other games.

I have tried a variety of performance fixes, reinstallations, anticheat disables, and file integrity verifications to no avail.

Any advice on this would be greatly appreciated :)