How to Cut Your CSS File Size by 40% Without Losing Any Styles
The article discusses effective strategies to reduce CSS file size by up to 40% without compromising styles. It highlights common issues such as unused selectors and duplicate declarations that contribute to bloated CSS files. By following a checklist of optimization techniques, web developers can enhance performance and improve page load times.
- ▪Most websites have CSS files that are 2-3 times larger than necessary.
- ▪Techniques such as removing unused selectors and merging duplicate declarations can significantly reduce file size.
- ▪Using custom properties instead of repeated values simplifies theme changes and reduces code duplication.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/kui_luo/how-to-cut-your-css-file-size-by-40-without-losing-any-styles-387 |
| Publication time | Wed, 27 May 2026 12:02:25 +0000 |
| Retrieval time | 2026-05-27T12:07:59.258Z |
| Last seen | 2026-05-27T12:07:59.258Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | ibiOi5J5_gNA |
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| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3884153) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Kui Luo Posted on May 27 How to Cut Your CSS File Size by 40% Without Losing Any Styles #css #performance #tutorial #webdev Most websites ship CSS that's 2-3x larger than necessary. After auditing over 50 production sites, I found the same patterns wasting kilobytes on every page load. Here's what actually works to trim the fat.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at DEV.to (Top).
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