I see reports of this going back to December 2023. I think if they could have fixed it, they would have by now. It got much worse after they added the latest pile of content, and somehow its server related – I’ve never seen a report from single-player.
This game is not playable in multiplayer in its current state, and it appears to be un-fixable.
Funcom can add a disclaimer to their store pages. Anything less is deception.
Or, if I’m wrong: fix it.