What this check inspects
Shipwork asks Google PageSpeed Insights to run Lighthouse for your page, mobile by default, and reads the four category scores: performance, SEO, accessibility and best practices. It also lists the failing audits with the largest estimated time savings.
What a failure means
A category below 50 is an error and below 90 is a warning. The opportunity audits are informational, but they are the most actionable part: each names a change and the milliseconds it would save.
How to fix it
- Work the opportunities in the order Lighthouse ranks them. Largest savings first.
- Compress and resize images, and serve modern formats.
- Remove or defer unused JavaScript and CSS, especially from apps and pixels you no longer use.
- Fix the accessibility failures it reports, since those overlap with how crawlers read the page.
A typical failure, worked through
The setupA store carries three abandoned marketing scripts and a large uncompressed hero image. Performance scores 41 on mobile.
What the check reportsThe check reports the failing performance category and lists reduce unused JavaScript and properly size images as the top opportunities, with estimated savings in milliseconds.
The pointLighthouse names the specific fix and its value. Start with the top opportunity rather than rewriting the theme.