The graphics is much too big In comparison to performance.
https://prnt.sc/vdzw4j
My little factory fills 16 yellow belts. The ASIF fills 48 but is 10 times bigger (in the area) and much more higher

OK maybe, the values are not directly comparable. Would it be be possible to get an assembly machine, doing the same performance on same size.
In my case 16 belts and 60x60 in size? That would be nice.
only a thougth, if my wish does not fit into your concept, could I make a clone of your mod?

There are mod settings that allow you to control the density (1 ASIF = X beaconed assemblers) and size (31x31 is the smallest I allow). The building size isn't the same as just the assemblers, it's also counting the footprint (and power usage) of the beacons as well. The mod assumes 12 beacons per assembler. That's why the recipe takes so many beacons and modules.

The "Maximum building size" probably meets my needs.
I didn't think that with default of 0 and standard ratio of 32 such big buildings would be built, how big are they at ratio of 1000? ;-)
https://prnt.sc/ve4trt
LOL OK could not zoom out.
The current scaling factor should be really smaller, current it does not really make sense.
But OK I will limit the Maximum building size and it will work for me. Thx

Depends on the ASIF. Green circuits are pretty straight forward 1000:1 would be:

assembler_count = 1000 + 1072 = 2072
beacon_count = assembler_count * 6 + 12 = 12,444
building_size = ( (assembler_count + beacon_count) * 3 )

So...43548 x 43548

But it gets worse for the more complex ASIFs. Speed/Prod 3 modules are only allowed to go up to 100 because they just get ridiculous above that point. A 100:1 speed3 building actually saves you 3799 assemblers. Blue circuits at 1000:1 saves you ~3600 assemblers. When I say 'saves you' I mean, you still need to manufacture all those assemblers/beacons/modules, but it saves them being entities on the map consuming UPS. So, a 1000:1 blue circuit factory would be on the scale of 70,000 x 70,000 in terms of building dimension. I think you can see why I put the 'static building size' option in. Even for me, placing a building down that massive is a PITA.

All fine. a single building of 57x57 in my cityblocks, that saves UPS, is what I was looking for. the best ration for me, i have to try out, but all better as 16 belts (for green circuits) is OK