Thanks for posting that. I see two things that might have an impact.
The first is that there's no listing for your i7-8700K's integrated UHD Graphics 630 GPU. Did you intentionally disable it in Device Manager, or in the UEFI/BIOS? I'm asking because there apparently were specific improvements made in PD18 for multiple GPU systems and you might not see any benefit from that if PD is only using your nVidia card.
The other thing that stands out is the number of crashes at the end of the report (the last 10 significant crashes are shown starting with WER). Some are PD-related, while others are from a Dell/Alienware app. I mention this because it's possible that some underlying system issue might be affecting PD, or possibly even using resources when you want PD to have them.
Please take a look at this
post for a couple of quick checks/repairs to run.
YouTube/optodata
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