Position correction seems to be wrong sometimes.

[AmonGruenwald]

Players sometimes get corrected to positions very far away or positions that do not seem plausible.

[kb173]

During these corrections, there is a large lagspike on the server:

This is accompanied by a constant framerate decrease on the client:

It seems like that is caused by the MinimapIcon's pixel read for whatever reason - must be an underlying issue with the Viewport image, maybe a thread stall? d4b3ea9 commented out the MinimapIcon and it seems like that at least caused a significant improvement.

Two other take-aways from this:

1. The client can bombard the server with packets, stalling it and creating lagspikes for everyone (essentially a very easy DDoS attack). We need to find a way to prevent that.
2. The lagspike is mostly caused by the Ringbuffer. It's implemented pretty inefficiently - we could try to turn it into a static array rather than constantly dynamically resizing it, or even write a simple C++ module for it since it's so central and commonly used.