#Performance

This page documents the Performance CDP domain supported by Lynx DevTool.

#Overview

• Scope: instance
• CDP domain: Performance

#Standard Methods

• Performance.disable
• Performance.enable

#Lynx Extensions

#Performance.getAllPerformanceEntries

Returns DevTool-recorded Lynx performance entries for the current page.

• Origin: lynx-extension
• Source: devtool/lynx_devtool/agent/domain_agent/inspector_performance_agent.cc

#Parameters

No parameters.

#Returns

#Notes

• Dispatches through LynxDevToolMediator to InspectorUIExecutor on the UI thread.
• The executor reads LynxShell::GetAllPerformanceEntries() and wraps the converted array as result.entries.
• PerformanceController only caches pipeline entries when LynxEnv DevTool is enabled. This is independent of the CDP Performance.enable method.
• The method returns an empty entries array when there are no cached entries.
• Cached entries are cleared by PerformanceController::ResetStateBeforeReload().
• The entry object is extensible. Fields beyond entryType, instanceId, name, frameworkRenderingTiming, and hostPlatformTiming are owned by the Timing API and may vary by pipeline type.
• The native implementation does not read request params.
• If the shell has already been destroyed, the current handler sends a response with the request id and no result object.

#Examples

Read recorded performance entries

Request:

{
  "id": 1,
  "method": "Performance.getAllPerformanceEntries"
}

Response:

{
  "id": 1,
  "result": {
    "entries": [
      {
        "entryType": "pipeline",
        "instanceId": 1001,
        "name": "loadBundle",
        "frameworkRenderingTiming": {},
        "hostPlatformTiming": {}
      }
    ]
  }
}

#Performance.getAllTimingInfo

Returns all Lynx timing information for the current page in microseconds.

• Origin: lynx-extension
• Source: devtool/lynx_devtool/agent/domain_agent/inspector_performance_agent.cc

#Parameters

No parameters.

#Returns

#Notes

• Dispatches through LynxDevToolMediator to InspectorUIExecutor on the UI thread.
• The executor reads LynxShell::GetAllTimingInfo() and uses that object directly as the CDP result.
• TimingHandler returns TimingInfo::GetAllTimingInfoAsMicrosecond(), so timestamp and duration values in timing maps are microseconds.
• The nested timing maps are extensible. Their keys are produced by the Timing API and may vary by page lifecycle, pipeline type, platform, and frontend framework markers.
• The native implementation does not read request params and does not require the CDP Performance.enable method.
• If the shell has already been destroyed, the current handler sends a response with the request id and no result object.

#Examples

Read all timing info

Request:

{
  "id": 1,
  "method": "Performance.getAllTimingInfo"
}

Response:

{
  "id": 1,
  "result": {
    "setup_timing": {},
    "extra_timing": {},
    "metrics": {},
    "update_timings": {},
    "url": "lynx://example/page",
    "thread_strategy": 0,
    "has_reload": false
  }
}