Windows/Mac: Opera's developers have released a very unstable but promising version of their web browser into the open. What does Opera 10.5 have to offer? If a quick test is any indication, faster JavaScript speed than any browser out there.


Based on Opera's reports of their new JavaScript engine, Caraken, being "7x faster" than the standard Futhark engine built into Opera 10.10, we ran it through Mozilla's Dromaeo JavaScript tests, which combine Apple's SunSpider and Google's V8 JavaScript benchmarks. Pure runs-per-second speed isn't everything, of course, and engines can be built specifically to max out in these kinds of tests. That said, the results of Opera 10.5, rolled into our last round of browser speed tests, were more than a little impressive, using Dromaeo as a measuring stick:


The chart up top is pulled from our most recent speed tests, with Opera 10.5 pre-alpha results rolled in. It shows some, shall we say, notable improvement. The gHacks blog put 10.5 against Firefox 3.6 beta and Chrome's development build in the SunSpider and V8 tests and found that Opera either beat, or came very close to, Chrome, in those separate runs, and usually left Firefox in the dust. We'll have to put Opera 10.5 through its full paces when it's out of its very unstable build.

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If you're the adventurous type and do want to give the pre-alpha a try, you'll also find improvements to the page rendering engine, new Private Browsing tabs and windows that don't track any history, and some interface and visual design tweaks, detailed in the post below. The big JavaScript improvements aren't as pronounced on the Mac build as on Windows, according to the development team, but are still there.

Opera 10.5 pre-alpha is a free download for Windows and Mac systems. Tell us if you think there's some real speed-ups in this build, and what else you like, in the comments.


Opera 10.5 pre-alpha for Labs [Opera]