Whatever you did with the update before stress test #37 seems like mostly a failure. Last night it was just the SWE 2:3 server BE kicking everyone and his mother, but I had a great time on the others, had no problems at all.
Tonight's stress test has been almost unplayable. Heavy lag, rubberbanding, kicks both random and BE. I got stuck on doors a lot, which was probably caused by the lag, still something I think you should look at.
I tried all three SWE stress test servers, they all had issues but it seems 2:2 was the worst one.
Also the loot economy behaved weird, in four-five hours I could not find a burlap sack anywhere, and despite checking every apple tree I came across I didn't find a single fruit. Nor did I last night, for that matter.
According to some players on Twitter, the US servers were doing better. They were all full though, I never braved the queue to check.
Good luck folks, hope you can get these performance issues fixed soon!