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Check performance and headers

Browser-measured timings, the heaviest resources, response headers and cookies, all from the same capture.

Observe + Reporting2 min✓ Tested in EPIC 1.0.4
  1. 1

    Open Performance

    Go to Observe → Performance. The health score, navigation timings (DNS, TCP, TLS, TTFB, load) and the largest resources are at the top. Click a metric or timeline row for what it means.

    Open Performance, EPIC screenshot
  2. 2

    Search resources

    Type in the resource search to filter by name or type, for example png.

  3. 3

    Read Header Intelligence

    Header Intelligence explains security headers, cache behaviour, CDN/edge evidence and content negotiation. Open Header Modification → takes you to Modify to test a change.

    Read Header Intelligence, EPIC screenshot
  4. 4

    Cookie Intelligence

    Click Refresh under Cookie Intelligence to count cookies, secure, HttpOnly, third-party and session cookies. This is read-only.

← Use the Intelligence tabsInspect requests and export a HAR →

Related guides

Observe + Reporting3 minInspect requests and export a HAREvery request from the Quick Scan, with filters, per-request detail and HAR/CSV export.Modify + Reporting3 minAdd, change or remove headersTest a header change in your own browser before anyone touches the server.