CDP Performance

Chrome DevTools Protocol (CDP) Performance API to capture metrics.

Selenium 4 uses the Chrome DevTools Protocol (CDP) which has a "Performance.getMetrics" command! Pylenium provides a simple wrapper to capture these metrics.

Syntax

py.cdp.get_performance_metrics() -> Dict

Usage

The Dictionary of performance metrics returned includes metrics like:

• ScriptDuration

• ThreadTime

• ProcessTime

• DomContentLoaded

correct usage

metrics = py.cdp.get_performance_metrics()

dictionary

{'metrics':
  [
    {'name': 'Timestamp', 'value': 425608.80694},
    {'name': 'AudioHandlers', 'value': 0},
    {'name': 'ThreadTime', 'value': 0.002074},
    ...
  ]
}

Arguments

• None

Yields

• Dict

Examples

def test_capture_performance_metrics(py: Pylenium):
    py.visit("https://qap.dev")
    metrics = py.cdp.get_performance_metrics()["metrics"]
    assert metrics
    assert metrics[0]["name"] == "Timestamp"
    assert metrics[0]["value"] > 0