Loop/Prompt Library / Speed, performance & cost
🔁 Trim unused styles
Removes unused styling code one piece at a time and keeps the removal only if every page looks exactly the same.
Use it when: Your site's style files have grown with old rules and leftovers.
🛑 Stops when: The style file is smaller and every tested screen still looks pixel-identical.
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Shrink the CSS that [site] sends to visitors without changing how it looks. First take screenshots of key pages at several sizes, light and dark mode, and common interactions. Record the CSS file size. Remove one rule or declaration at a time, rebuild, and compare screenshots. Keep it only if every screenshot is identical and the file got smaller. Otherwise put it back. Try at most [40] removals. Report size saved and what screens were not tested.
Review every change the agent makes before you keep it. Set a budget or round limit — the prompt includes one.
Idea from Forward Future's Loop Library · by Christian Katzmann. Prompt rewritten in plain English by FixKit AI.
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