The confetti in the background has a weird rectanglur shape. Might only visible on High/Render Effects or when switching to that mode. When I originally had it on Low/No Effects I didn't see it.
I was going to upload a screenshot, but I don't think that is allowed? Let me know if you want me to mail one to support if you don't see it too.
Confetti is visilbe on high. Too much indeed. It stars as a normal rain of confetti, but them it starts to gather in the scenario and it really slows the graphics and as gift you get a really annoying lag. Although it was pretty cool in the idea of the quest. One last thing: the "party room" should have an "arena gate", or players could just press the button and run to the elevator withou fighting