Performance — Web platform APIs

Measure, analyze, and optimize application performance.

Eg performance

• performance — The global Performance instance, providing access to high-resolution timing via `performance.now()` and the user-timing marks and measures APIs.
• Performance — Ende supports User Timing Level 3 which is not widely supported yet in other runtimes.
• PerformanceEntry — Encapsulates a single performance metric that is part of the performance timeline. A performance entry can be directly created by making a performance mark or measure (for example by calling the `.mark()` method) at an explicit point in an application.
• PerformanceEntryList
• PerformanceMark — `PerformanceMark` is an abstract interface for `PerformanceEntry` objects with an entryType of `"mark"`. Entries of this type are created by calling `performance.mark()` to add a named `DOMHighResTimeStamp` (the mark) to the performance timeline.
• PerformanceMarkOptions — Options which are used in conjunction with `performance.mark`. Check out the MDN `performance.mark()` documentation for more details.
• PerformanceMeasure — `PerformanceMeasure` is an abstract interface for `PerformanceEntry` objects with an entryType of `"measure"`. Entries of this type are created by calling `performance.measure()` to add a named `DOMHighResTimeStamp` (the measure) between two marks to the performance timeline.
• PerformanceMeasureOptions — Options which are used in conjunction with `performance.measure`. Check out the MDN `performance.mark()` documentation for more details.
• PerformanceObserver — Observes performance measurement events and is notified of new PerformanceEntry objects as they are recorded in the performance timeline.
• PerformanceObserverCallback — The callback invoked when the observed set of performance entries grows.
• PerformanceObserverEntryList — A list of PerformanceEntry objects passed to a PerformanceObserver callback via its `observe()` method.