performance 🧪

Canary 🧪

This API is currently only available in React Native’s Canary and Experimental channels.

If you want to try it out, please enable the Canary Channel in your app.

The global performance object, as defined in Web specifications.

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Reference

Instance properties

eventCounts

See documentation in MDN.

memory

See documentation in MDN.

rnStartupTiming ⚠️

Non-standard

This is a React Native specific extension.

Provides information about the startup time of the application.

ts

get rnStartupTiming(): ReactNativeStartupTiming;

The ReactNativeStartupTiming interface provides the following fields:

Name	Type	Description
startTime	number | void	When the React Native runtime initialization was started.
executeJavaScriptBundleEntryPointStart	number | void	When the execution of the application bundle was started.
endTime	number | void	When the React Native runtime was fully initialized.

timeOrigin

Partial support

Provides the number of milliseconds from the UNIX epoch until system boot, instead of the number of milliseconds from the UNIX epoch until app startup.

See documentation in MDN.

Instance methods

clearMarks()

See documentation in MDN.

clearMeasures()

See documentation in MDN.

getEntries()

See documentation in MDN.

getEntriesByName()

See documentation in MDN.

getEntriesByType()

See documentation in MDN.

mark()

See documentation in MDN.

measure()

See documentation in MDN.

now()

Partial support

Provides the number of milliseconds from system boot, instead of the number of milliseconds from app startup.

See documentation in MDN.