Mobile Speed and Desktop Speed Score Explained
Answer
The Mobile and Desktop Speed scores come directly from the Google Lighthouse service. The DCI Score will be flagged as an issue if the score is not 100. Siteimprove uses Lighthouse performance scores and flags any score below 100 as a technical issue, even when a site may appear to load quickly for users.
FAQ
Why is Mobile Speed or Desktop Speed flagged as a technical issue?
The Mobile and Desktop Speed scores come directly from the Google Lighthouse service. The DCI Score will be flagged as an issue if the score is not 100.
How should I interpret the Performance score?
Please check the Performance score and check where this falls based on Google’s own scale:
- 0–49 = Poor
- 50–89 = Needs Improvement
- 90–100 = Good
Why might my site be flagged even if it seems fast?
While the site may load quickly under normal conditions, Lighthouse runs tests simulating slower mobile devices and network connections, which can highlight issues that may not show up in real-world usage for everyone. Some of the things impacting the score include longer JavaScript execution, a large DOM size, and delays in loading the largest visible element on the page.
Does a flagged DCI score mean my site performs poorly?
To clarify, our DCI score flags performance when it does not equal 100, which doesn’t mean the site is performing poorly overall, but that there are still technical areas for improvement based on Lighthouse’s standards.
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