The next version of Opera will support DNS prefetching, a feature designed to cut down on the time necessary for loading a web page. Whenever you will move your mouse cursor over a link, it will start prefetching. Opera will only perform DNS look-ups, nothing else, and DNS will be resolved for HTTP links only and look-ups are restricted to five every second.
You can test this feature in Opera 12.10 Snapshot, which is now available to download here.
Download for Windows, Mac and Linux