[Rseding91] [2.1.12] Stuttering when interacting with the tech tree

[darkszero]

This happens with latest 2.0 but I've managed to reproduce it with 2.1. It reliably happens with my late game nullius base which makes this quite noticeable, but sadly it went away when I reduce the number of mods in the save file to just Nullius. My investigation tells me that it needs a high time usage from the factory itself to be more noticeable, so the provided save files has just the mods needed for the base to keep going (except for waterfill which I need to port to 2.1, so the base will stop working at some point).

It's also necessary to have the tech screen not pause the game. So either multiplayer or the `technology-gui-pauses-game` setting.

Included is a video of the stutters in question. How to reproduce: load the file, open tech tree and quickly add multiple copies of some infinite tech. All research queue operations have the stutter and maybe even just clicking other techs too. Feels like rendering the tech tree is being expensive, but that's just me guessing.