Factorio Forums

Currently, there's a limit to each production stat. 3 are shown on the UI. Quality is not.

Speed limit (negative) is -80%, so 20% speed.
Productivity limit (positive) is +300%, so 4x speed (Should show, not sure if it applies to Drills? Someone confirm, else Prod research 31+ is useless)
Efficiency limit (positive effect, negative percentage) is -80%, so 20% consumption.
Quality can show as -14.7%, and this should show (0% = limit) to avoid confusion of "can this downgrade" and to respect already existing UI practices.

Good idea. Perhaps this is done for mods? Although it would be nice to have a toggle button for modders

Does negative quality increase starting spoilage percentage when an item is crafted?

trancexpress wrote: Tue Feb 04, 2025 6:54 am Does negative quality increase starting spoilage percentage when an item is crafted?

There is no negative quality, 0% is lowest effect it can have. Even then the spoilage isn't some % based but by quality rank the item is given, common, uncommon, rare...