If we go down the path where times are not scaled down, smelting setups will remain just as big as before. Then i don't see why we should have a loss at all. 2 posts are now contradicting, so either one has to use custom configs. I think i am also in favor of reduced crafting time. Like when you ...

Sorry for late reply, 4s for compressing feels good the last few gameplay hours.

Latest recipes to smelt compressed ores seems out of balance, not?

Original:
7 Steel = 35 Iron = 122,5s
Modded:
7 Steel = 40 Iron = 41s

Original:
16 Iron = 16 Ores = 56s
Modded:
16 Iron = 20 Ores = 14s

20 times ...

Early furnace setup with your mod in my new save game to test throughput, uncompressing ore-blocks at the bottom and compressing iron plates at the top:

DeCompressingIron.jpg
Beacons missing for now. 3-4 T3-assemblers without any speed modules are enough for a blue belt on full load. I tested ...

I don't know how to fix it... Seems Factorio itself calculates the material costs some way i can't influence it?

Maybe this comment from Rseding91 get you a hint:
Also don't forget you're in cheat mode which makes "total raw" show far more than normal due to it thinking the player can craft any ...

Thanks, i guess i should remove the compressed coal usability as fuel anyway. Some other compression mods let it be used as fuel too.

I suggest to define compressed coal as fuel (like briquettes -> https://en.wikipedia.org/wiki/Briquette) but to reduce the fuel value. Coal compression is not as ...

If you put "compressed coal" into a boiler, the game crashes.
I know the compressed items are no fuel, but crashes are never good.
Maybe you can add a line to the coal prototype to prevend this:

fuel_category = "chemical",

to

{
type = "item",
name = "compressed-coal",
icon ...

Reproduction

1. Install mod "OreCompress" from mod portal (https://mods.factorio.com/mods/Zaflis/OreCompress)
2. Start new game.
2. Put "compressed coal" (item from mod) into boiler.
3. Game crashes.

Error.jpg
Maybe a bug from the mod itself or the item prototype:

{
type = "item",
name ...