Beta v15.1: I tried fixing someone's savegame... — Puffin Planes Steam update #891203

I asked a content creator (who I will keep anonymous) for their absolutely massive savefile. They obliged, and I opened it and my computer started stuttering real bad. To be clear, I am running an i7-13700k and 4070 so if a game of Puffin Planes is laggy for me, then it will be laggy for almost everyone. I got to work over the next couple of days and made dozens of performance improvements that are way too complicated to explain. One of the most important improvements I made was smoothing out lag spikes by distributing the work over multiple frames. This really helped with stability in the massive savefile, which had something like eight hundred planes. Which I will admit is way more than I ever expected anyone to make in my game. But evidently people want to push my game to the limits, and while it was not designed for that...I will do my best to optimize so y'all leave positive reviews...