X17 - HDRi 4K Backgrounds - they are smaller so even on a long process rendering they will still be a bit blurry. But they will not kill your computer if you have a slower graphics card. I have a 4090 and I still use the 4k because I like the effect of a slightly blurry background - draws attention to your model.   Download the Library here... https://drive.google.com/file/d/1yWtMoAV0IryyEDPZRBXNWttF3AkPSGrx/view?usp=sharing