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1. Too Many Uncompressed Images

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🚫 Used raw PNGs and full-res images directly.
✅ Fixed by lazy loading + converting to WebP + using srcset.

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2. Client-Side Rendering for Everything

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🚫 My homepage took 4s to load because all data fetched after render.
✅ Switched to SSR (Next.js) + cached API data = instant first paint.

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3. Ignoring Lighthouse Suggestions

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🚫 Didn't care about accessibility or

unused JS.
✅ Ran PageSpeed Insights regularly and removed unused packages, reduced bundle size by 40%.