In scenes like this my computer just go crazy

looks really good and I agree that blank body models its good if they arent important for the story its saves you a little time and youre pc not going to crazy :)

Great scene with a lot going on! There's an optimizer tool for Daz you can use to reduce the size of those figures out of focus.

Need update gpu, mate!

To add on to the other comment , There is also a Daz product I believe called Billboards(?) which is super good for multiple random background people

Keep up the good works and happy weekend!

just as a bit of advice... a lot of devs in situations like this to cut down on render time and save heavy burn, they use blank body models for people who aren't important for the scene... i get that it may cut down on realism but its just something to think about.