How does Cities Skylines really run on switch with 150K population Part 2/2

Framerate becomes an issue almost immediately when playing the game. Upon starting, some users were reporting about 30 FPS, but this seems to slow considerably as the game goes on and a city expands. By the time one reaches a medium city, to say nothing of aiming for a large metropolis, the FPS crawls to between 10 and 20.