CSL2 still has some serious performance issues, like it’s better than it was, but at high pops it really start to chug, and a lot of weird behaviors start to occur in parts of the simulation. Which really makes it hard to build out complex multi modal transit networks which kind of require a large pop to make work.

It does some things better than CSL1, namely around allowing a city to operate without cars, and supporting mixed use buildings. Although it has 0 support for bikes. Like bikes just don’t exist.

I jump between both depending on what I want to do. If I want to build a compact city with nearly no cars, I got to CSL2. For large cities with complex transit networks I go for CSL1.