Performance notes
Applies to: TreStack Timer, every plan
Updated: 26 September 2026
- Bundle: 11.4 KB gzipped
- Measured: 26 September 2026
- Theme measured: Horizon, one page
What loads, and from where
The storefront code is one script bundle, served from the Shopify CDN as part of the theme app extension and loaded with defer, so it does not hold up the page. Your published timers are written into the page by the app embed, so there is no request to our server to fetch them. While no timer is published, the embed loads nothing at all.
A web font loads only the character sets the timer text uses, from the same extension. A background image is served from your own store Files. The one request that goes to our server is a small count event to timer.trestack.app when a timer is seen, clicked, closed, or completed, which is what the analytics and the monthly views read.
The numbers
The script bundle measured 11.4 KB gzipped on 26 September 2026, against a target of under 15 KB.
On the same day we ran Lighthouse mobile on a product page on Shopify Horizon theme with a top bar and a product timer that had a background image and a web font, five runs with the app and five without, and compared medians. There was no measurable drop in the performance score, layout shift was the same, and the product image stayed the largest paint. That is one measurement on one theme. It is not a guarantee for every store, which is why the next section exists.
Measuring your own store
Lighthouse on a live storefront is noisy: two runs on an unchanged page often differ by several points. Run each configuration at least three times and compare medians, on the same page, with the same device setting, in a private window with no browser extensions. Test the page the timer is actually on, logged out.
If the median moves by more than a couple of points, send us both sets of reports and the page URL. We treat that as a bug, not a tuning question.
Measuring the cost, in four steps.
Pick one page and log out
The page the timer will be on. Private window, no browser extensions, no customer session.
Run three baseline reports
Same device and throttling each time. Save all three and note the medians.
Publish the timer
Change nothing else on the theme in the same session, or the comparison means little.
Run three more and compare
Compare medians for largest paint and layout shift, not only the headline score.
Settings reference
If this does not work
The failures most likely on this procedure, with the check that resolves each one.
Email timers
A countdown image for marketing emails, drawn when the email is opened. How to get the snippet, what it shows after the deadline, and why you unpublish rather than delete.
Theme compatibility
What the app needs from a theme, what has and has not been tested, page builders, and what to redo when you switch or upgrade your theme.