Google Web Accelerator
The Google Labs released the free Web Accelerator, a Beta software package intended to speed up your web browsing. To do that, Google acts as a giant proxy, storing parts of the web on their machines for quicker access. It also manages to download only the changes of a web page if you viewed it before. Last not least, Google uses prefetching technology to download results – like pages linked in a search result – even before you click on them (Google recently experimented with this feature in Firefox).
From:http://blog.outer-court.com/archive/2005-05-05-n47.html
How does Google Web Accelerator work?Google Web Accelerator uses various strategies to make your web pages load faster, including:
Sending your page requests through Google machines dedicated to handling Google Web Accelerator traffic.
Storing copies of frequently looked at pages to make them quickly accessible.
Downloading only the updates if a web page has changed slightly since you last viewed it.
Prefetching certain pages onto your computer in advance.
Managing your Internet connection to reduce delays.
Compressing data before sending it to your computer.
From:http://webaccelerator.google.com/support.html