Chrome DevTools is a set of developer tools built into the Chrome browser, available completely for free. To perform an audit you need to open the page to test in Chrome browser and open Chrome Dev tools. Lighthouse Audit is recommended to perform this audit in incognito mode to avoid the influence of e.g.
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Chrome DevTools OverviewLighthouse AuditPerformance InsightsPerformance tabPerformance MonitorExtrasSummary29 Impressions