funnyduck99 wrote: Sun Feb 08, 2026 9:12 pm I run into performance issues on switch 2.

i took a look at your save, there's no mayjor ups hogs that i can see, so the next step would just be the standard "inserter minimizing" ups optimizations.
always legendary stack inserter if you can, and direct insert as much as possible

so as i'm screwing around i try entering in -50 as the amount of coal to be delivered to a reactor (don't ask) but then i get this tooltip
https://i.imgur.com/r6UhQ1J.png
saying it can range from 0 - 18446744073709551615
this seems obviously wrong to me as i know it can't be higher than 2^31-1 but ...

https://youtu.be/16_WJW1kjgs

video here. you can set the recipe to quality pipes. the output will still be normal quality though

if you connect a green or red wire to a burner mining drill then you can only read the ores beneath it, not the fuel. for other buildings you can read all items that are in it so this sticks out as an oversight.
not being able to read the fuel means if you're using inserters to take coal out of ...

https://youtu.be/OGOhGuGuh-c

if you place a ghost of an item, request the items to be delivered to the machine, then change the recipe, the old requests will linger. once the machine is built the construction bots will attempt to deliver it, during which the request gets cleared

this is kind of ...

are you looking for feedback on how this can be aproved? or are you just wanting to show it off. i have designs for blue science that are denser than what you have (blue science 39x22 = 858. 45 spm using assembler 2 and no moduels)
are you trying to keep it really simple by having only straight belts?