Measure page load timing
The action reads the Navigation Timing API and logs DNS, TCP, TTFB and full load times to the console.
Code to copy
try {
const nav = performance.getEntriesByType('navigation')[0];
if (nav) {
const round = function (n) { return Math.round(n) + ' ms'; };
console.log('JustZix page timing:');
console.log(' DNS:', round(nav.domainLookupEnd - nav.domainLookupStart));
console.log(' TCP:', round(nav.connectEnd - nav.connectStart));
console.log(' TTFB:', round(nav.responseStart - nav.requestStart));
console.log(' DOM ready:', round(nav.domContentLoadedEventEnd - nav.startTime));
console.log(' Load:', round(nav.loadEventEnd - nav.startTime));
} else {
console.log('JustZix: navigation timing not available');
}
} catch (err) { console.error('JustZix page timing:', err); }How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Enable the action panel, add a button in the Actions tab and paste the code into it — run it with one click.
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