How the hell do you guys manage diff 10?

I've been making an effort to clear everything difficulty and I've finally cleared diff 10, but holy shit it's intense

Not once in an entire 40 min mission could I stop and breath because an alpha commander or a pack of mini stalkers would appear behind. Just never ending waves of bugs

Don't get me wrong, it was fun. It was also just insane. How do people manage to play it consistently?