Source: http://lifehacker.com/5577194/opera-106-final-is-all-kinds-of-fast
Windows/Mac/Linux: Opera caught us by surprise by including faster JavaScript handling than Chrome in its 10.5 browser. In 10.6, there's even faster performance, plus greater HTML5 and WebM video support, a streamlined menu button, and AVG malware protection baked in.
We've been following Opera 10.6 through its fast-moving development, from alpha to latest speed tests, and while (possibly!) working on a new set, we can say that Opera remains a fast-loading, quick-moving browser. With the latest release, there's also a collaboration with anti-malware provider AVG to prevent real-time protection against phishing, nefarious software, and other security breaches, explained at Opera's site.
Opera 10.6 is a free download for Windows, Mac, and Linux systems. Tell us what we missed as you use it yourself in the comments.