Short description
firstPaint marks the point when the browser renders anything that is visually different from what was on the screen prior to navigation. This includes non-default background paint and the enclosing box of an iframe.
New Relic event types
  • SyntheticRequest

    Data source: Synthetics
Units of measurement milliseconds (ms)

Google's User-centric Performance Metrics contains detailed information about its Paint Timing API and firstPaint.