Still Optimizing for Things That No Longer Matter?

You’re not alone. Web performance has evolved, but some outdated myths are holding developers back from real speed improvements.

In this post, we’ll bust the biggest lies developers still believe in 2025 — and show you what to do instead to truly enhance your Core Web Vitals.

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🚫 Lie #1: Minifying CSS and JS Is Enough

Sure, minification reduces file size — but it does nothing for unused code. Modern frameworks often come bloated, and minifying doesn’t fix the actual problem.

✅ What to Do Instead:
Use tools like PurgeCSS or UnCSS to remove unused styles and scripts. For React/Next.js, enable tree-shaking and use dynamic imports.

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🚫 Lie #2: A Good Lighthouse Score = Good UX

Lighthouse is a snapshot, not a full picture. Many sites score 90+ but still have poor LCP or real-user frustration.

✅ What to Do Instead:
Focus on field data from Google Search Console, especially:

• LCP (Largest Contentful Paint)
• CLS (Cumulative Layout Shift)
• INP (Interaction to Next Paint)

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🚫 Lie #3: Server Location Doesn’t Matter Anymore

With CDNs, many assume server location is irrelevant. But TTFB still depends heavily on your origin server.

✅ What to Do Instead:

• Use edge networks like Cloudflare Workers, Vercel Edge Functions
• Reduce third-party scripts (they often delay response)

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🚫 Lie #4: Performance Is a “DevOps Problem”

Wrong. Web performance is everyone’s responsibility — frontend, backend, product, and even SEO teams.

✅ What to Do Instead:

• Budget performance in your product backlog
• Use performance budgets in Lighthouse CI
• Make performance part of your “definition of done”

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✅ Real Fixes for 2025

• Replace jQuery-based plugins with modern vanilla JS
• Use Qwik, Astro, or Svelte for content-heavy static sites
• Implement lazy loading for off-screen content
• Cache aggressively at both edge + browser levels
• Optimize fonts with font-display: swap and preload important assets

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📌 Final Thoughts
Web performance in 2025 is about user experience, not arbitrary metrics. Drop the old tricks — and focus on what really matters.

🔗 For more details with images and visuals, visit:
https://devtechinsights.com/web-performance-lies-we-still-believe/

💬 Let me know in the comments — which performance myth have you seen developers still believe?