Suggest an editImprove this articleRefine the answer for “Why is it important to remove unused code?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**Removing unused code** matters because it directly hurts a site's speed, size, and stability, even if it "seems harmless". **Key point:** removing unused code is not about aesthetics, it's optimization: less to load, faster to run, easier to maintain.Shown above the full answer for quick recall.Answer (EN)ImageRemoving unused code matters because it directly hurts a site's speed, size, and stability, even if it "seems harmless". --- ### 1. **Increases bundle weight** Every extra byte is extra loading, especially on mobile and slow networks. More code means a longer wait. --- ### 2. **Slows down parsing and execution** JS first has to be loaded, parsed, compiled, and executed. Even if code is never used, it still goes through these steps. --- ### 3. **Clogs the cache and memory** Unnecessary code can end up in the browser cache, take up memory, and affect GC (garbage collection), especially in SPAs. --- ### 4. **Makes maintenance harder** Dead code gets in the way of navigating the project, creates noise, confuses people, and can cause side effects (if it has global calls, imports, or side effects). --- ### 5. **Affects Web Vitals** More scripts mean worse LCP, TTI, TBT, and therefore worse SEO and UX. --- **Conclusion:** Removing unused code is not about aesthetics, it's optimization: less to load, faster to run, easier to maintain.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.