The Performance interface provides access to performance-related for the current page. It's part of the High Resolution Time API, is enhanced by the Performance Timeline API, the Navigation Timing the User Timing API, and the Resource Timing API.
The Performance interface provides access to performance-related for the current page. It's part of the High Resolution Time API, is enhanced by the Performance Timeline API, the Navigation Timing the User Timing API, and the Resource Timing API.
(clear-marks this & args)
Method.
The clearMarks() method removes the named mark from the browser's
entry buffer. If the method is called with no arguments, all
entrieswith an
entry type` of "mark" will be removed from
performance entry buffer.
performance.clearMarks(); performance.clearMarks(name);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMarks
Method. The clearMarks() method removes the named mark from the browser's entry buffer. If the method is called with no arguments, all entries` with an `entry type` of \"mark\" will be removed from performance entry buffer. `performance.clearMarks(); performance.clearMarks(name);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMarks`
(clear-measures this & args)
Method.
The clearMeasures() method removes the named measure from the
performance entry buffer. If the method is called with no arguments,
performance entries
with an entry type
of "measure" will
removed from the performance entry buffer.
performance.clearMeasures(); performance.clearMeasures(name);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMeasures
Method. The clearMeasures() method removes the named measure from the performance entry buffer. If the method is called with no arguments, `performance entries` with an `entry type` of \"measure\" will removed from the performance entry buffer. `performance.clearMeasures(); performance.clearMeasures(name);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearMeasures`
(clear-resource-timings this)
Method.
The clearResourceTimings() method removes all performance entries
an entryType
of "resource" from the browser's performance
buffer and sets the size of the performance data buffer to zero.
set the size of the browser's performance data buffer, use the
method.
performance.clearResourceTimings();
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearResourceTimings
Method. The clearResourceTimings() method removes all `performance entries` an `entryType` of \"resource\" from the browser's performance buffer and sets the size of the performance data buffer to zero. set the size of the browser's performance data buffer, use the method. `performance.clearResourceTimings();` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/clearResourceTimings`
(get-entries this & args)
Method.
The getEntries() method returns a list of all web.performance.PerformanceEntry
for the page. The list's members (entries) can be created by
performance marks or measures (for example by calling the mark()
at explicit points in time. If you are only interested in performance
of certain types or that have certain names, see getEntriesByType()
getEntriesByName()
.
`General syntax:
entries = window.performance.getEntries();`
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntries
Method. The getEntries() method returns a list of all `web.performance.PerformanceEntry` for the page. The list's members (entries) can be created by performance marks or measures (for example by calling the `mark()` at explicit points in time. If you are only interested in performance of certain types or that have certain names, see `getEntriesByType()` `getEntriesByName()`. `General syntax: entries = window.performance.getEntries();` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntries`
(get-entries-by-name this name type)
Method.
The getEntriesByName() method returns a list of web.performance.PerformanceEntry
for the given name and type. The list's members (entries) can
created by making performance marks or measures (for example
calling the mark()
method) at explicit points in time.
entries = window.performance.getEntriesByName(name, type);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntriesByName
Method. The getEntriesByName() method returns a list of `web.performance.PerformanceEntry` for the given name and type. The list's members (entries) can created by making performance marks or measures (for example calling the `mark()` method) at explicit points in time. `entries = window.performance.getEntriesByName(name, type);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntriesByName`
(get-entries-by-type this type)
Method.
The getEntriesByType() method returns a list of web.performance.PerformanceEntry
for a given type. The list's members (entries) can be created
making performance marks or measures (for example by calling
mark()
method) at explicit points in time.
entries = window.performance.getEntriesByType(type);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntriesByType
Method. The getEntriesByType() method returns a list of `web.performance.PerformanceEntry` for a given type. The list's members (entries) can be created making performance marks or measures (for example by calling `mark()` method) at explicit points in time. `entries = window.performance.getEntriesByType(type);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/getEntriesByType`
(mark this name)
Method.
The mark() method creates a timestamp
in the browser's performance
buffer with the given name. The application defined timestamp
be retrieved by one of the web.performance.Performance
interface's
methods (getEntries()
, getEntriesByName()
or getEntriesByType()
).
performance.mark(name);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark
Method. The mark() method creates a `timestamp` in the browser's performance buffer with the given name. The application defined timestamp be retrieved by one of the `web.performance.Performance` interface's methods (`getEntries()`, `getEntriesByName()` or `getEntriesByType()`). `performance.mark(name);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark`
(measure this & args)
Method.
The measure() method creates a named timestamp
in the browser's
entry buffer between marks, the navigation start time, or the
time. When measuring between two marks, there is a start mark
end mark, respectively. The named timestamp is referred to as
measure.
performance.measure(name); performance.measure(name, startMark); performance.measure(name, startMark, endMark); performance.measure(name, undefined, endMark);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure
Method. The measure() method creates a named `timestamp` in the browser's entry buffer between marks, the navigation start time, or the time. When measuring between two marks, there is a start mark end mark, respectively. The named timestamp is referred to as measure. `performance.measure(name); performance.measure(name, startMark); performance.measure(name, startMark, endMark); performance.measure(name, undefined, endMark);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure`
(memory this)
Property.
[Read Only]
None.
timingInfo = performance.memory
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/memory
Property. [Read Only] None. `timingInfo = performance.memory` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/memory`
(navigation this)
Property.
[Read Only]
The legacy Performance.navigation read-only property returns
web.deprecated.PerformanceNavigation
object representing the
of navigation that occurs in the given browsing context, such
the number of redirections needed to fetch the resource.
navObject = performance.navigation;
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/navigation
Property. [Read Only] The legacy Performance.navigation read-only property returns `web.deprecated.PerformanceNavigation` object representing the of navigation that occurs in the given browsing context, such the number of redirections needed to fetch the resource. `navObject = performance.navigation;` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/navigation`
(now this)
Method.
The performance.now() method returns a web.dom.DOMHighResTimeStamp
,
in milliseconds.
t = performance.now();
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/now
Method. The performance.now() method returns a `web.dom.DOMHighResTimeStamp`, in milliseconds. `t = performance.now();` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/now`
(onresourcetimingbufferfull this)
Property.
The onresourcetimingbufferfull property is an event handler that be called when the resourcetimingbufferfull event is fired. This is fired when the browser's resource timing performance buffer full.
callback = performance.onresourcetimingbufferfull = buffer_full_cb;
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/onresourcetimingbufferfull
Property. The onresourcetimingbufferfull property is an event handler that be called when the resourcetimingbufferfull event is fired. This is fired when the browser's resource timing performance buffer full. `callback = performance.onresourcetimingbufferfull = buffer_full_cb;` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/onresourcetimingbufferfull`
(set-onresourcetimingbufferfull! this val)
Property.
The onresourcetimingbufferfull property is an event handler that be called when the resourcetimingbufferfull event is fired. This is fired when the browser's resource timing performance buffer full.
callback = performance.onresourcetimingbufferfull = buffer_full_cb;
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/onresourcetimingbufferfull
Property. The onresourcetimingbufferfull property is an event handler that be called when the resourcetimingbufferfull event is fired. This is fired when the browser's resource timing performance buffer full. `callback = performance.onresourcetimingbufferfull = buffer_full_cb;` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/onresourcetimingbufferfull`
(set-resource-timing-buffer-size this max-size)
Method.
The setResourceTimingBufferSize() method sets the browser's resource
buffer size to the specified number of "resource" performance type
objects.
performance.setResourceTimingBufferSize(maxSize);
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/setResourceTimingBufferSize
Method. The setResourceTimingBufferSize() method sets the browser's resource buffer size to the specified number of \"resource\" `performance type` objects. `performance.setResourceTimingBufferSize(maxSize);` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/setResourceTimingBufferSize`
(time-origin this)
Property.
[Read Only] [Experimental]
The timeOrigin read-only property of the web.performance.Performance
returns the high resolution timestamp of the start time of the
measurement.
var timeOrigin = performance.timeOrigin
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/timeOrigin
Property. [Read Only] [Experimental] The timeOrigin read-only property of the `web.performance.Performance` returns the high resolution timestamp of the start time of the measurement. `var timeOrigin = performance.timeOrigin` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/timeOrigin`
(timing this)
Property.
[Read Only] [Deprecated]
The legacy Performance.timing read-only property returns a web.deprecated.PerformanceTiming
containing latency-related performance information.
timingInfo = performance.timing;
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/timing
Property. [Read Only] [Deprecated] The legacy Performance.timing read-only property returns a `web.deprecated.PerformanceTiming` containing latency-related performance information. `timingInfo = performance.timing;` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/timing`
(to-json this)
Method.
The toJSON() method of the web.performance.Performance
interface
a standard serializer: it returns a JSON representation of the
object's properties.
myPerf = performance.toJSON()
See also: https://developer.mozilla.org/en-US/docs/Web/API/Performance/toJSON
Method. The toJSON() method of the `web.performance.Performance` interface a standard serializer: it returns a JSON representation of the object's properties. `myPerf = performance.toJSON()` See also: `https://developer.mozilla.org/en-US/docs/Web/API/Performance/toJSON`
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