Opera mystery code promises 'game changing' browser speed
How does it work? Opera’s not saying. Instead, it says this: Opera Turbo uses advanced compression technology to speed up data transfer and to reduce the amount of data that needs to be downloaded in order to view the page. Apparently, Turbo will also offer multiple optimization modes.
My hunch is that they’re doing some kind of centralised caching/proxy thing, and sending the websites as compressed blobs of data.