At last year's PDC, held in November, Microsoft showed a graph showing scores of a variety of Web browsers in the SunSpider JavaScript benchmark, to show off the progress that the company was making with Internet Explorer 9. Another such graph was shown off at the recent MIX event. What was most interesting about the graph was not IE9's progress, but Opera's.
Opera 10.10, released at about the same time as Microsoft held its PDC event, fared pretty badly. Faster than IE8, but slower than everything else, including the (private) PDC IE9 build. Opera 10.50, released a few weeks ago? It's the fastest browser on the chart. It's faster even than prerelease versions of Firefox and Chrome, not to mention faster than the public IE9 Platform Preview build. SunSpider isn't the be-all/end-all of JavaScript performance, and it fails to represent real-world scenarios in a number of ways. However, it's clear that Opera's JavaScript performance has improved substantially over the period of about six months.
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