Massive Unplayable Lag/Latency Only in Labyrinth

This has been going on for at least 6-8 months.

Every time I enter the labyrinth my ping goes up from about 20-100ms average to about 300-1000ms average.

I'm running on wireless, with high signal strength and no major issues. Playing the normal game works fine for the most part with periodic lag spikes of 200-400ms for very brief periods.

When entering the labyrinth, from the entry way, to the lab selection, all the way through Izaro and the reward chests, the entire thing is extremely laggy, to the point where it becomes unplayable or crashes.

My FPS and frame time remain very low, this does not appear to be a hardware related issue, this is specific to ping/latency.

Throughout the labyrinth, the game hitches terribly and my ping generally jumps anywhere from 100-1500ms, averaging as mentioned at about 10 times higher than normal the entire time.

I've tried changing wireless connections, changing realms, waiting until the lag temporarily dies down. Nothing seems to make any difference.

Most recently ping was hitting 1,000+ and then got to the absolute last trial, and the game just lag-froze, then crashed to desktop, no warning, no error message, nothing in the log (last log entry was Izaro's 2nd aspirant's trial win message.)

Same, just died twice trying to help a friend through lab. I get random 1-15s freezes during which I can still move my mouse, view items, read skills, open the chat window, etc. I can also stream the game over discord, while talking, so it's not related to my own connection at all. Lab servers are fucked and it's incredibly frustrating.