It's a Unity game. Why are people genuinely surprised that performance is absolute garbage? Both CS2 and KSP2 (kerbal) REQUIRE incredibly specific tuning that unity simply does not offer. The latter being rigid bodies at scale (which is semi impossible with a dedicated engine) and the former being "almost-factorio-level" low level cell processing. The graphics of both are second tier to that.
But no, lets use Unity...
Edit: I got former and latter mixed up.