Js engines

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Js engines

  1. 1. JavaScript enginesperformance comparison
  2. 2. The JavaScript engine race: 2008 and 2009Recently there has been a race by browserdevelopers to develop even faster JavaScriptengines in response to the growing usage ofjavascript frameworks and ajax, as theusers experience is directly influenced bythe browsers ability to execute the sitesclient-side code.
  3. 3. In 2008, Google Chrome was praised for itsJavaScript performance, but other browserssoon received new JavaScript engines whichwere faster. Later, Google Chrome won inthe races of better performance. Chromesstrength is its application performance andJavaScript processing speed, both of whichwere independently verified by multiplewebsites to be the fastest amongst the majorbrowsers of its time.
  4. 4. With the advent of WebKits Squirrelfishand Mozillas TraceMonkey JavaScriptvirtual machines, Chromes JavaScriptexecution performance has been found to beslower.Google responded with the Danishdeveloped V8 which boosted JSperformance in Google Chrome 2.
  5. 5. On June 2, 2008 the WebKit developmentteam announced SquirrelFish, a then-newJavaScript engine that vastly improvesSafaris speed at interpreting scripts. Theengine was one of the new features in Safari4, released for developers on June 11, 2008the final JavaScript engine was called Nitro.
  6. 6. In January 2009 the engine then known asSquirrelFish Extreme (SFX) was enabled forMac OS X on x86-64 architectures as itpasses all tests on that platform by AppleInc.[12] Released June 30, 2009 Firefox 3.5includes the optimization technique whichoffered "performance improvementsranging between 20 and 40 times faster"compared to Firefox 3 in some cases.
  7. 7. The JavaScript engine race: 2010In early 2010 the Norwegian Opera browserreplaced the aging Futhark with the fasterCarakan, which was 2.5 times faster in earlytesting Others in the race at this timeinclude Apples Safaris Nitro (the engineformerly known as SquirrelFish), andFirefoxs new JägerMonkey (a "cross-childof Nitro with the older TraceMonkeyEngine").
  8. 8. Microsoft lagged behind, lacking adedicated JavaScript engine and being theslowest of the major browsers, although bymid-2010 they held out the carrot of Chakrain then unreleased Internet Explorer 9.JägerMonkey began testing in the publiclyreleased Firefox 4.0 beta in the Summer of2010. Safari 5, also released in summer2010, featured 30 percent faster JavaScriptperformance than Safari 4 (using the Nitroengine).

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