+ Speedometer is a browser benchmark that measures the responsiveness of Web applications. + It uses demo web applications to simulate user actions such as adding to-do items. +
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Detailed Results
+About Speedometer
+ +Speedometer measures simulated user interactions in web applications.
+ ++ The current benchmark uses TodoMVC to simulate user actions for adding, completing, and removing to-do items. + Speedometer repeats the same actions using DOM APIs — + a core set of web platform APIs used extensively in web applications — + as well as six popular JavaScript frameworks: Ember.js, Backbone.js, jQuery, AngularJS, React, and Flight. + Many of these frameworks are used on the most popular websites in the world, such as Facebook and Twitter. + The performance of these types of operations depends on the speed of the DOM APIs, the JavaScript engine, + CSS style resolution, layout, and other technologies. +
+ ++ Although user-driven actions like mouse movements and keyboard input cannot be accurately emulated in JavaScript, + Speedometer does its best to faithfully replay a typical workload within the demo applications. + To make the run time long enough to measure with the limited precision, + we synchronously execute a large number of the operations, such as adding one hundred to-do items. +
+ ++ Some browser engines use an optimization strategy of doing some work asynchronously to reduce the run time of synchronous operations. + While returning control back to JavaScript execution as soon as possible is worth pursuing, + a holistic, accurate measurement of web application performance involves measuring + when these related, asynchronous computations actually complete. + Thus, Speedometer measures the time browser spends executing those asynchronous tasks in Speedometer, + estimated as the time between when a zero-second delay timer is scheduled and when it is fired.
+ ++ Note: Speedometer is not meant to compare the performance of different JavaScript frameworks. + The mechanism we use to simulate user actions is different for each framework, + and we’re forcing frameworks to do more work synchronously than needed in some cases to ensure run time can be measured. +
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