Was encountering a problem with players yesterday where the game was becoming out of sync. No sync errors were occurring, but as the game went on, the player was falling behind the rest of the players. It seemed their game sim was running slower the other players.
They started out with the same speed as other players, but as the match went on, they would fall more and more behind. The player did not see their actions in real time. They would issue a unit order, and the unit would not move on their screen for as long as two minutes after the order was issued. The other players would see their actions happen in real time though.
The issue seems to be related to the lack of 'lag grace' periods now. The player was seeing everything happen, just not until after the action had happened, the delay got longer over the course of the game. Initially there was no delay, but by the end of the game (Which lasted 32 minutes) the player was a full two minutes behind all other players.