Tantalus Software Senior Programmer explained the performance issues

[Rafario]

For those who don't know, Tantalus is the company that ported Cities Skylines (1) to the consoles. TLDR: Using unity HDRP pipeline was a mistake from CO, since it lacks scalability

https://twitter.com/BenSimsTech/status/1717018626346360874

I believe that only because Tantalus isn't involved with Cities Skylines anymore that their devs are now free to tell those things without fearing being involved in the PR storm of being 100% honest.

[Peri]

Wow. So the same culture that created so many of the original Skylines' problems continued.

Simply amazing.

[coderzero]

I was hoping they would move away from Unity for this one.

[AgeOfBacon]

Originally posted by Peri:

Wow. So the same culture that created so many of the original Skylines' problems continued.

Simply amazing.

Look at how many fans are defending them here. Why would they change? They could litterally make a game that looks like a 1995's Theme Park, running at 12FPS, and the fans would still defend them.

[KasparL]

Originally posted by coderzero:

I was hoping they would move away from Unity for this one.

its seems unity is generally bad for games with lots of assets on the screen

[banzaimonkey]

Originally posted by coderzero:

I was hoping they would move away from Unity for this one.

Likewise. I'd read somewhere that they were moving to Unreal for CS2 but I guess that was just a disappointingly incorrect rumor.

[Xiyng]

Originally posted by coderzero:

I was hoping they would move away from Unity for this one.

Me too, but judging by their Reddit AMA, it was actually a really good call for the simulation part, which was the main performance problem in the first game. Apparently the alternatives didn't just offer anything nearly as good. Clearly Unity and rendering are a challenging combo though...

Generally speaking, Unreal would have been an obvious alternative, but I'm not sure how well it would have supported modding. My impression is that C# is great for modding and C++ not as much.