This page
http://labs.opera.com/news/2009/03/13/
implies that Turbo Mode compresses the images, but the page lays out the same. Thus, it's more for connections that are bandwidth-impaired (i.e., dialup, slow wireless links, etc.), rather than CPU impaired. I suspect there will be not much difference with older Macs, and the page will look somewhat worse for no good improvement.
Still, it's an interesting thought.
http://labs.opera.com/news/2009/03/13/
implies that Turbo Mode compresses the images, but the page lays out the same. Thus, it's more for connections that are bandwidth-impaired (i.e., dialup, slow wireless links, etc.), rather than CPU impaired. I suspect there will be not much difference with older Macs, and the page will look somewhat worse for no good improvement.
Still, it's an interesting thought.