Once this program is active, check the 'Bus Interface' section. You should see an entry that reads something like this: "PCI-E 2.0 x16 @x16 2.0".
Depending on your motherboard you may see different details here. However the key part of this entry is the @x number. It may read @x4, @x8 or @x16. With higher performance cards, you'll be looking for x16 to be displayed here.
You will have to check the manual which came with your PC to identify the motherboard you have, or if you know the motherboard then search then specifications online. The purpose is to find what type of PCI-E slots your motherboard has. You then need to find out if your graphics card is seated in a x16 slot or one of the other options. If it's not in a x16 slot, you need to move it to one to get the full benefit of that cards performance.
If you're unsure, a good rule of thumb is to seat your graphics card in the top PCI-E slot, which is the one closest to your CPU. Once this is confirmed then reboot your system, re-open GPU-Z and check the 'Bus Interface' again. If it didn't say @x16, it should now. Launch Planet Coaster as normal and you should see a significant boost in performance.
5. Report a bug
If you continue experiencing a performance issue or your game continues then you should submit a bug report.
These can be submitted on our dedicated bug reporting forums. Please make sure you include the following:
1) What you were doing just before you encountered this issue. 2) Your Steam name or ID 3) A DxDiag file
In rare cases customers may need to contact the support team to request a refund. Please ensure you contact Steam Supportif you purchased the game from Steam.