This runs on a separate WordPress demo site, clearly a demo and not client work, so it can’t disturb this website.
The test
- Run Google PageSpeed Insights five times on the demo site and record the median mobile score.
- Apply one site-wide caching and image-optimisation fix, not a hand-edit of a single page.
- Run PageSpeed Insights five more times and record the new median.
What counts as a win
The median mobile score rises by at least 20 points. PageSpeed results vary from run to run, which is why I use the median of five runs. If the “before” median is already above 80, a 20-point rise isn’t possible, and I’ll report that instead of a win or a fail.
What I can’t test yet
Whether the fix changes search position. The demo site is hidden from Google, so that half of the test will probably say “not enough data”. I report it separately and don’t count it toward the result.