Ive noticed if i go somewhere else after going by guardians i get huge lag that seems like its coming from minecraft rather than the server itself, this seems to happen when im in the water with them, it only lags during teleportation from the guardians by qny teleport command, i go to -100 then to the destination (e.g. home spawn etc)
There's a lot going on there to isolate. Do I recall correctly that you're using a switch2 and have vibrant visuals enabled? At a guess, the very likely mining fatigue, rush of chunk data (depending on your configured view distance) being sent (wirelessly) to your client operating at the very limit of its display capability (vibrant visuals) sounds like a recipe for a post-teleport lag-enhanced experience... (Can confirm no observable server lag)
Yeah, all of that is correct, i will try this again with vibrant visuals disabled and edit this post (Edit it still lags on fancy (vibrant visuals off) i reduced my render distance to 10 chunks and i hope to reply with more soon