Just to mention, JS has no multithreading support and trying to run scripts concurrently is going to get you bucketloads of deadlock or way too much overhead trying to put locks on every variable. Also, most web pages are limited to loading by the download rate, not the rendering speed. Performance in technologies like webgl and html5 is based more on how the underlying tools are implemented below the programming on a page (albeit, you can easily make a page run like barf).
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Rekonq 2.0 KDE Web-Browser Brings New Features