Function getNavigationTiming

Returns
    | {
        dnsLookup: number;
        domContentLoaded: number;
        loadComplete: number;
        serverResponse: number;
        tcpConnection: number;
    }
    | null

Navigation timing metrics or null if unavailable

const timing = getNavigationTiming();
if (timing) {
  console.log('DNS Lookup:', timing.dnsLookup, 'ms');
  console.log('DOM Content Loaded:', timing.domContentLoaded, 'ms');
}
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