3.27 patch 3/11 bricked so much

From never having had issues ever with this game for years and years, even the 3.27-launch was super smooth.

To last nights patch (or somewhere in the morning EU time, unsure) the mapping has become insane, perfectly fine in hideouts/towns, but in maps the stutter/delay on actions is beyond anything ive experienced before even in ultrajuiced content.

Kicks back out to the login-screen after stutters in maps at first, but now i even had multiple maps where it drops out just loading through a portal in the map device, not even getting into the map.

The message that pops up after it throws out is "An unexpected disconnection error occured."

What happened in the last patch, really?

Edit:
An interaction i notice does make a difference is Networking mode, Lockstep vs Predictive. Predictive throws you out straight up when it doesnt stabilize, Lockstep only causes stuttering rubberbanding and massive delay (clicking multiple times then seeing it happen over the course of 10 seconds) whereas the fps and ms is perfectly good...