Delirium network lag spikes

I'm getting huge multi-second network lag spikes in maps when Delirium is enabled. My character just freezes in place for multiple seconds and then teleports around the screen when the network catches up.

There's lag on other maps but nowhere near this bad, just short 100ms bursts here and there, but delirium is totally unplayable.

Also experiencing this. Trying everything I can to sort this out, it's completely bricking portions of my atlas.