alt Hacker News0ad is a fun game but the last few times I have tried to play it with my friends it lagged very bad once a few units were moving around. I actually was able to get it to play kind of normal by hacking the pathfinding code to give up after a fixed iteration count that was low. It worked kind of, but broke path finding a lot, obviously.
The crux of the issue is that their simulation is single threaded. It's a complicated problem to do both deterministic and multi-threaded, but I feel some of us could help them.
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For me the main problem with 0AD multiplayer is that if any player loses their connection even for a moment for any reason, the game either halts completely or forks so that they can't rejoin. Quite frustrating, especially for longer campaigns. It's also impossible to save and restore in multiplayer.
Two thousand years ago they'd barely have maps, I don't see why units need pathfinding anyway. In the Age of Empires series it had bizarre effects, like you could steer an enemy army around by building a wall across a forest path, forcing them to take a different path to their target (your base), since they apparently saw the wall with their psychic powers.
Realistically soldiers should head in the right compass direction and hope for the best. But then you (the player) shouldn't have a proper map of your own, either.