June 2025 Theme Vitals Update

Welcome to the monthly update! Consider sponsoring this newsletter to support new feature development for this project.

The Chrome User Experience Report (CrUX) data for June 2025 is now live on Theme Vitals. In this post, I’ll cover:

• Change in the data population
• Aggregated theme performance changes
• New flagship Shopify theme Horizon - a CWV failure?
• Most improved themes for web performance
• Highest growth themes in market share

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Change in data population

The total number of Shopify websites included in the data set decreased slightly.

New themes added this month were Horizon, Savor, Tinker, Dwell, Atelier, Fabric, Vessel, Pitch, Carbon, Ritual, Sampo, Nova, Heritage, Swiss, Loka, and Maya.

Mosaic and Modules were dropped due to no data.

I now show 309 (up from 295) total themes.

Aggregated performance across all themes

Here are the median, min, and max performance numbers on mobile for all the Shopify themes measured on mobile devices:

(For a more accessible version, see it live on the website: Aggregations).

Performance dipped again slightly on nearly all metrics this month, reflecting the performance of the overall web. Part of this may be due to an issue on Android which should be addressed soon. I'll let you know if I learn more from the Chrome team.

New flagship Shopify theme Horizon - a CWV failure?

This is the first month we have data for the new Shopify flagship theme Horizon and its variations. While initial data can be misleading, it currently looks like a failure on mobile Core Web Vitals performance (not enough data on desktop yet):

• only 38.4% of websites pass all Core Web Vitals
• 81% pass LCP
• 93% pass CLS
• only 32.8% pass INP

See full data on the Horizon theme page.

It will be interesting to see if this trend improves in the coming months or not. It might take a while to fix as the numbers are quite bad - only 4 themes are worse and one of those is a Horizon variation (Fabric). INP can also be more difficult to fix. I'll keep you updated.

Most improved themes

For mobile devices, these themes had the most improvement in passing all Core Web Vitals:

1. Flux: 10.7 points (112 origins)
2. King: 6.0 points (82 origins)
3. Tailor: 5.2 points (98 origins)
4. Nordic: 5.0 points (73 origins)
5. Essentials: 4.9 points (92 origins)

For desktop devices, these themes improved the most:

1. Mavon: 9.0 points (81 origins)
2. Shark: 8.3 points (55 origins)
3. Madrid: 7.8 points (97 origins)
4. Stockholm: 7.3 points (61 origins)
5. Gain: 5.2 points (86 origins)

When themes on these lists have a small number of origins/market share, some of the improvements could be due to the underlying population of websites changing.

Highest market growth

As a reminder, the market share numbers calculated in Theme Vitals are not the same as number of installs. Here, we’re calculating market share based on the number of origins (websites/domains) in CrUX. CrUX only shares data for websites that reach a certain threshold of popularity. This threshold sometimes changes. To learn more, check out the methodology page for CrUX.

Growth in number of origins

The themes that already have the largest market shares usually have the highest growth in number of origins. Dawn returned to the top 5 this month:

Mobile

1. Concept: 249
2. Dawn: 235
3. Sleek: 140
4. Trade: 100
5. Wonder: 74

On desktop, the top 5 themes are:

Desktop

1. Concept: 114
2. Sleek: 58
3. Stretch: 41
4. Impact: 37
5. Wonder: 36

Percent growth in origins

Raw growth is interesting but usually focuses too much on the existing themes with high market share. Here, I show which themes are growing the fastest on a percentage basis:

Mobile

1. Hyper: 63.2%
2. Motto: 40.8%
3. Stretch: 40.1%
4. Refine: 29.4%
5. Flux: 28.7%

Desktop

1. Stretch: 50.6%
2. Hyper: 42.6%
3. Flux: 21.4%
4. Wonder: 20.8%
5. Release: 20.3%

Closing

The Theme Vitals site and this newsletter are meant to be a helpful resource to the Shopify community. Consider sponsoring or upgrading to a paid subscription to help develop new features.

As always, if you have ideas for new features or other improvements, let me know!

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