I use
UNITY-Arc-system-Works-Shader
I use a regular uv map
Example
Texture resolution 4096x4096
Format PNG
The problem is that when I load more than one character, the render either crashes or the textures don’t load.
Who has any advice on optimization?
it also depends on your system.
like RAM, VRAM, CPU etc.
everything works in tandem to get a render going.
we have no idea what’s going on unless we get some more info.
it’s like asking why your car keeps stalling.
we don’t know the brand, what kind of engine and fuel etc…
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What information do you need?
I can’t give you the model itself because it’s too heavy.
I decided that the problem is in the textures since I load ASK_Base, ASK_Sss, ASK_ilm, ASK_Detail, for each body part separately.
I suspect the main problem is that my UV looks like this
And for AКC material it should be like this
it also depends on your system.
like RAM, VRAM, CPU etc.
everything works in tandem to get a render going.
But having a set of large 4K UDIM’s might explain some bits.
What can I do if I have an old laptop from 2010?
I can’t buy a new one even if I wanted to.
ah… a laptop. but… what kind?
How many Gb of RAM, what kind of video card?
Are you rendering on the CPU or the GPU? etc.
We’re not psychic magicians 
I would start resizing your textures to 2K, or maybe even 1K, and see if it will render. Your hardware is the limiting factor here with a laptop that old. 
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CPU:Intel(R) Core™ i7-2670QM CPU @ 2.20GHz 2.20 GHz
RAM:6,00 ГБ
GPU:
Nvidia GeForce GT 525M
Intel HD Graphics 3000
Lower texture resolution, use tiles to save memory if you are rendering high resolution. What do you expect with a laptop like that?.. If it was possible, everyone would be working with the cheapest hardware, but we are not, unfortunately. You need a more powerful computer, that’s it. That should be obvious.
Then you can’t render a lot of stuff either. One would think that is obvious. You could try a render farm, but they cost money, or there is SheepIt, that is free, but you need to render other projects to earn points and it’s going to be challenging with that laptop.
The thing is, you say you cannot buy another laptop but it’s apparent you also cannot render any meaningful size scenes with the one you have. Out of those two problems, buying a new laptop is the easier one to solve, because the second one has pretty much zero chance of working. Unless you are OK with lowering the quality of the assets you use significantly. 6GB of RAM is going to be a real problem - you cannot fit much into that. I mean you can use it… But it is going to be pretty limiting as you can already tell.
You could try using some light linux distro to reduce RAM usage. Maybe run it from a flash drive so you don’t need to go through the trouble of installing it.
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