Anything concerning sims seem to be delayed on lots with large amount of sims on Speed 3.

This generally means the simulation is bogged down for some reason. There are many reasons why this might happen - could be autonomy, could be routing, could be something else. They are often specific to a game situation. The issue will vary by machine spec, although your machine looks pretty good.

We address them as we encounter them, and it's always helpful to have saves that exhibit the problem. If you could post your save with as much detail about how to reproduce the issue as possible that would help.

-SGMS