A very useful tool for players conscious about performance in game is displayed UPS/FPS.

Here is a nice explanation from helpful player of Factorio:

FPS = Frames Per Second. This number is sacrificed first if UPS is below 60.
UPS = Updates Per Second, the number of times the game engine updates all entities on the map.

Because the terminal does not need to update all the time, we might want to add instead:

TPS = Ticks Per Second. That is the actual number of ticks executed, not the target value we show in UI now.

This would allow even non-developers to notice and quantify performance problems and make life much easier for developers hunting those problems down.

This could be a debugging option turned on in UI and by command line flag.