Boni,

Id say a big problem is your render settings. Your min shading rate is lower than the setting I use for drafts. Pixel samples can be lowered if you are making large renders and that will help speed up your render time. If your scene is lit well you can lower IC and IDLQ like I have in my settings. I never have a problem with IDL splochies an such. Use tone mapping if you want to brighten the scene even more without adjusting lights.

Also you might want to use BB's Sphere all the time instead of the one you are using. It really helps light up the whole scene. let me find a render on my HD

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740