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Sia Karamalegos @sia.codes · 13/01/2026

December data is now live in Theme Vitals - see how Shopify themes perform for Core Web Vitals... Also have a new feature this month! Percent of themes with improved overall CWV performance themevitals.com/newsletter/2... #webperf #shopify

Number of themes with improved CWV
For all themes with performance data, the number of themes which improved in their passing all Core Web Vitals (CWV) metric as well as how many got worse or stayed the same.

In Dec 2025, on mobile devices, 46% of themes improved their passing CWV score. On desktop, 25% of themes improved.

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