[pierreh]

(...) I would first blame Firefox, especially if you have many tabs open. (...)

Thanks, Darvince, I think that you have identified the main culprit. I do tend to open many tabs in Firefox, and leave them open even if I don't need them immediately, or any longer. And, as you point out, some web sites cause various scripts to run, some quite poorly written and therefore resource-intensive.

Thanks too, Brian, for your suggestion to bring the issue to the help desk on Discord. I'll keep this in mind, in case the problem keeps bothering me even if I do a preventive restart if I want to play the game after having done many other things on my machine. For now I'll simply do a restart before playing the game if I have done a lot of other things, which is usually the case.

---------

A short while ago we had a few exchanges about the game sometimes growing many instances of the same building. I found a rather extreme example in Deramey, where in a residential area on the edge of the city, the game grew no less than 9 instances of the same building next to each other. Let's say that this was a development by a real estate promoter that had lots of money but limited creativity...