Cities: Skylines 2's individually rendered teeth aren't responsible for the game's performance issues - at least not all of them

gamesradar.com:

As Cities: Skylines 2 players try to figure out what they can do to improve performance, they're coming up with some pretty wild theories about what's wrong - including the idea that the game is rendering every citizen's individual teeth. Developer Colossal Order has addressed that claim, and while it's not exactly wrong, it's not the full truth either.

Most 3D games feature some sort of 'level of detail' scaling, which ensures that characters and objects that are further away from the camera will be rendered in less detail than those that you're seeing up close. The various gradations of those models are often referred to as 'LODs,' and good LOD management is an essential component of maintaining a solid balance between graphical fidelity and solid frame rates.

That's why many players were shocked by a post from Reddit user Hexcoder0 revealing that "the game DOES render individual teeth with no LOD as far as I can tell." Hexcoder0 was able to check in on what the graphics card renders while the game is running and found that, yeah, the character models for the individual citizens wandering around on the streets do indeed appear to have individually rendered teeth. 

This sparked a whole tangential debate about whether mods could turn these citizens into stick figures, and some players worried that the game's lifepath system - which tracks citizens from birth into adulthood and old age - might make reducing their detail impossible.

In response to this whole teeth and lifepath thing, developer Colossal Order said in a statement that the "citizen lifepath feature does not tie to citizen geometry and does not affect the performance figures of the characters. We know the characters require further work, as they are currently