Sorry if this sounds a bit aggressive but I don't care about any of your bugfixes or improvements when the game has such huge performance issues.
Yeah. I don't like the phrase too much, because it's mostly used as a meme... but right now Stellaris is literally unplayable at some point after 2400. I could set the game to spectator right now, leave the computer on, go to sleep, and wake up to find that only a couple decades had passed.
You could fix every other bug and the game still wouldn't be worth bothering with.