PerformanceEventTiming: processingEnd property

Baseline 2025

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Since December 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

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The read-only processingEnd property returns the time the last event handler finished executing.

It's equal to PerformanceEventTiming.processingStart when there are no such event handlers.

Value

A DOMHighResTimeStamp timestamp.

Examples

Using the processingEnd property

The processingEnd property can be used when observing event-timing entries (PerformanceEventTiming). For example, to calculate input delay or event processing times.

const observer = new PerformanceObserver((list) => {
 list.getEntries().forEach((entry) => {
 // Full duration
 const duration = entry.duration;
 // Input delay (before processing event)
 const delay = entry.processingStart - entry.startTime;
 // Synchronous event processing time
 // (between start and end dispatch)
 const time = entry.processingEnd - entry.processingStart;
 });
});
// Register the observer for events
observer.observe({ type: "event", buffered: true });