Too many people are asking for a water expansion pack. I'm one of them. Swimming pools, water slides, diving boards.
No matter how good your PC is, if you go crazy and try to create huge parks with 20k guests and 30 rides with detailed scenery, you will run into fps. When you look at Planet Coaster, it is a modern game. Filled with rich graphics and a lot of computational work going on in the background with scenery, reflections, shadows, AI, etc. High end hardware can handle it, but there's only so much it can handle, before it begins to slow down. So we should be realistic.
These are the official Recommended requirements for the game. If you computer does not meet all of these, your computer is the thing that needs improving, not just the game.
Windows 7 (SP1+) / 8.1 / 10 64bit
Processor Intel i7-4770/AMD FX-8350
Memory12 GB RAM
Graphics nVidia GTX 980 (4GB) / AMD R9 380 (4GB)
DirectX Version 11
https://www.planetcoaster.com/en/store
I have had Planet Coaster since April 2016, when it was in Alpha version. Planet Coaster has A LOT more rides and content, than it did back in 2016! AND..... performance hasn't really dropped! It's pretty much performing the same even slightly better.
What makes a game run slower, is (a) a computer that does not meet the recommended requirements listed by Frontier (b) putting TOO MUCH into your game.
I have a pretty good PC, and am proud of it, even though I invested NZ$3000 in it. So I would rather them bring the DLC. It is a heavily requested feature. And if they delay that, they're going to get more people complaining about it.
As one site puts it...
"With that said, these system requirements are far more demanding than your typical tycoon game. That's probably because Planet Coaster isn't your typical game, and you can see from the various footage and screenshots released that it's packed with detail and has massive environments. As such, the minimum requirements are fairly steep for a management game"
http://www.game-debate.com/games/index.php?g_id=23290&game=Planet Coaster