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Sia Karamalegos

@sia@front-end.social · 4 days ago

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

https://themevitals.com/newsletter/2026-01/

#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. — 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.

December 2025 Theme Vitals Update

December 2025 performance data is live now. Overall Shopify performance is the same on mobile and down on desktop, and Horizon still struggles. New feature this month!

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