Horrible lag in Conquest mode to the point of being unplayable

[Demize99]

I am doing, I kid you not, around 10 fps on some of those missions.
This game is clearly not using my rig to the max as my GPU, CPU and RAM are never at 100% usage (CPU 30-40% average, GPU 60-80% average and RAM 40-60% average), so it must be down to bad optimization.
There is no way this has been play tested once you reach the point where every mission is on RED ALERT difficulty because its just not functional.
I'm even wondering how some people got the achievement for finishing this game mode because outside of spending 2 hours per mission playing in choppy slow motion with an average of 10 fps, its frankly impossible, and you'd have to be insane to play like this.
The obvious solution is to spawn less but better, more lethal enemies instead of 5 gazillion fodder planes at the same time.
The engine simply cannot handle this many moving parts at the same time, it should be basic common sense.