When I said that the 'game' would slow down, I meant that the player would not have a reason to force it ahead or there are new versions of the simulation to be crunched and reviewed. The in game time advances based on stuff actually happening, or not,, and not based on some imprecise speed controller.

In my attempt you are not going to have a time where you are running at full speed and failing to notice that one of your city blocks is starved for power for months, or that garbage is piling up to the point that you get the popup of "Something horrible is going wrong!", because the moment something is going wrong it is going to be obvious in the reports.

Based on your telling, I sense that this is not much of city builder. Sliding from arcade to simulation is a story but that's another. Yours seem more of a "user friendly" way of entering numbers to create simulation.

What if I want to build something or query what's going on? It is a reason for me, will I pause game in that case?

Also about missing garbage/power shortage or so, this is why I always play Simcity at normal speed, boring sometimes but my style.