Oh and it probably works in open desert with no problem. But there units can move as platoons and terrain isn't as challenging and restricted as say for example in wooded areas .. or FINLAND. Where ai needs to do lot more calculations. To avoid trees, rocks, huge number of small bodies of water, and swamps, And bridges.
While Finland is extreme example. It quite effectively brings up limitations of how much calculations SB can handle at once.
Even when I restricted my units mostly open areas when I reached roughly size of 4 active companies on move there started to be noticable amount of anomalies and network problems.