Comment by orbital-decay

>It can't be that hard to do occlusion calculations server-side, right?

I think you already know the answer. Yes, it's bottlenecked by latency and jitter (of the laggiest player, no less), and in addition to that the maximum possible movement velocity makes it much much worse in fast paced games. It's been attempted a few times since at least late 90's, with predictable results.

In other words, complete server-side calculations are a fantasy. Besides, they won't even remotely make cheating impossible or even harder! Even complete hardware lockdown won't.