---
title: "CSS transfer exceeds the budget (perf/css-budget)"
description: "perf/css-budget: Stylesheets are render-blocking: the browser paints nothing until they arrive and parse."
canonical: https://void-design.vercel.app/rules/perf/css-budget
lastModified: 2026-09-16
---

# CSS transfer exceeds the budget

`perf/css-budget` · severity **warn** · category Performance · detected by `void perf` and `void audit`

## Why it matters

Stylesheets are render-blocking: the browser paints nothing until they arrive and parse.

## How to fix it

Remove unused CSS (Tailwind v4 only emits used utilities; check @source globs and safelists), split route CSS, and drop CSS frameworks you override.

## More performance rules

`void perf` reports 25 rules in this category. Core Web Vitals and bytes: LCP, CLS, TBT, TTFB, JavaScript, CSS, fonts, images, caching and compression, measured as the median of several runs on a throttled mobile and a desktop profile.

- `ttfb-slow` Server response (TTFB) is slow — [perf/ttfb-slow](https://void-design.vercel.app/rules/perf/ttfb-slow)
- `fcp-slow` First Contentful Paint is slow — [perf/fcp-slow](https://void-design.vercel.app/rules/perf/fcp-slow)
- `tbt-high` Main thread is blocked by long tasks during load — [perf/tbt-high](https://void-design.vercel.app/rules/perf/tbt-high)
- `js-budget` First-load JavaScript exceeds the budget — [perf/js-budget](https://void-design.vercel.app/rules/perf/js-budget)
- `font-budget` Web font transfer exceeds the budget — [perf/font-budget](https://void-design.vercel.app/rules/perf/font-budget)
- `too-many-fonts` Too many font files are downloaded — [perf/too-many-fonts](https://void-design.vercel.app/rules/perf/too-many-fonts)
- `image-budget` Image transfer exceeds the budget — [perf/image-budget](https://void-design.vercel.app/rules/perf/image-budget)
- `too-many-requests` Page makes many requests — [perf/too-many-requests](https://void-design.vercel.app/rules/perf/too-many-requests)

Detected by `void perf` and `void audit`. Explain it in a terminal: `void rules perf/css-budget`