devtools_performance
Retrieve browser Navigation Timing metrics to diagnose slow page loads, including TTFB, DOM content loaded, and full load time. Optionally get per-resource timing to pinpoint expensive assets.
Instructions
Return page performance timing from the browser Navigation Timing API.
navigation — key milestones for the current page load: ttfb_ms — Time to First Byte (server latency) dom_loaded_ms — DOMContentLoaded (page parsed, defer scripts done) load_ms — full load event (all resources fetched) dns_ms — DNS lookup duration connect_ms — TCP/TLS connection duration request_ms — time from request sent to last response byte transfer_size — response body size in bytes
resources (when include_resources=True) — per-asset breakdown: name, type, duration_ms, transfer_size, start_time
Use this to identify slow pages, expensive assets, or server latency. Complements devtools_network_all which captures requests via BiDi listeners.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| include_resources | No | Include per-resource timing entries (stylesheets, scripts, images…). Can be large on busy pages. |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||