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I was annoyed by the tech tree performance so I decided to look into ways to improve it, this is the first basic attempt.
It turns out a major resource hog is loading every tech tree item's tooltip every time you open the trees, but this string isn't actually used for the tree itself. When you hover over an item it uses a delegate, the calculate string is instead used for the "Full search" option, which I have never really used.
Removing this assignment will improve performance by a decent margin, but "break" part of the full search functionality. Be warned if you used that feature.
Additionally I have change a list.Contains into a double null check, which by my understanding of the code should give the same result, at least for current versions of the game.
Installation Info This mod is built for version 0.3.39, but should work for other versions unless they make changes to the tech tree themselves.