Thank you so much for the quick responses.
I actually checked the particle folder before even posting here, after finding that in a couple of other threads. None are there to be deleted.
No presets are used for my characters, they all have markings/equip from the normal game or the legendary markings.
Lag is not the issue, "FeralHeart.exe has stopped working" is.
Will try to reset their locations and edit this after I try it. Never knew you could do so, or that it was even a thing.
Edit: Okay, couldn't find any sort of user panel. The only options were to edit the characters, use the characters, and yeah. Taking the chance, I did end up able to use the previously unusable, however. Apparently, my computer truly ended up having trouble with how many people were in those maps - or so my guess is, anyway.
Also, I have no idea where to find the option to lower view distance and so on. If this thread is now locked due to the issue being found and the issue not being a technical one, please message me with how to go about that.
Again, thank you for the quick responses.