Originally posted by FERAL Ellie:

Company of Heroes 2 uses a deterministic engine, and relies on clients to generate the same outcome for all gameplay-relevant calculations, like pathfinding, unit positions, spawns and combat.

Any differences in the maths, even at the nth decimal place of precision, will accumulate to a tangible divergence in behaviour and ultimately a disconnect. When dealing with multiple architectures, operating systems and optimising compilers, tracking down all possible differences is a long and complex task.

So this is basically a problem with mathematics? Aren't there cross platform libraries available which ensure that calculations are the same regardless of platform?

I do not know what the game code looks like though, so changing the way calculations are performed everywhere might not be feasible.

Thanks for being forthcoming about the information, though. I really appreciate the quality work that goes into Feral's ports.