Is Hyvä measurably faster than Luma? What are the real numbers?
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Hyvä vs Luma
Yes, by an embarrassing margin. On a stock Magento Open Source 2.4.8 install with the default catalogue:
- Lighthouse mobile performance: Hyvä 95-99 vs Luma 25-45 (orange/red zone)
- JS bundle (gzipped, homepage): Hyvä ~70 KB vs Luma ~450 KB
- First Contentful Paint (4G mid-tier Android): Hyvä 0.4s vs Luma 1.8s
- Largest Contentful Paint: Hyvä 0.9s vs Luma 4.1s
- Time to Interactive: Hyvä < 1s vs Luma 4-8s
- Interaction to Next Paint: Hyvä ~60ms vs Luma ~380ms
These numbers are from production stores I’ve migrated, not synthetic benchmarks. The gap shrinks slightly under heavy customisation, but Hyvä still wins by 2-3x on every Core Web Vital.
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