Allow me to start.
One thing I do vividly remember is that there is a huge black box surrounding the player off screen. The purpose of it was to detect whether a pursuer was lost or not. Its a pretty sh*tty system, as I did not and still do not know how to calculate distance between two objects in GM. I do know that this box does indeed cause some performance issues in-game, so if we can phase it out that would be good.
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