Web Application Performance

You can see additional differences in performance between the different browsers in the Fireflies test drive. Having HTML5 video, and audio, and canvas, and CSS3 gradients work well together is important because developers will combine technologies in real-world Web applications.

IE10 is the first browser to support several new performance APIs coming out of the W3C’s working groups. The test drives for setImmediate, requestAnimationFrame, and PageVisibility illustrate how these APIs enable developers to make the Web faster and more responsive even while Web sites make better use of battery life on mobile devices.

Web Application Performance

Web workers enable a host of new programming scenarios for the Web. With them, Web applications can be more responsive by offloading complex JavaScript to run in the background. For example, casual games might choose to run the logic for the "computer player" in a Web worker while users take their turn. This test drive (link) demonstrates the performance benefit of offloading work from the page to a Web worker. (Note that FF5 does not support Channel Messaging, an additional feature of this technology that the test drive can use.)

With support for Async script, developers can control the impact on Web page performance of their scripts downloading from their sites.

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