Boar Saying: Improving Browser Performance

John Resig , the creator of jQuery , just recently made a small presentation
in Google. The theme of the meeting was performance improvements in browsers (in
upcoming releases), some innovations in Javascirpt engines, new ways
working with DOM and amazing effects using CSS styles. But about everything
in order.

Number of processes per browser

One of the most interesting innovations in IE8 and Chrome is that
tabs are now divided into several processes. It gives a huge
performance advantage since now various web
pages can be loaded and executed in parallel without taking away
machine resources from each other. At the same time, browsers like FF,
Opera and older versions of IE load / execute several pages in
one process (different pages run in separate threads).
Read fully on my blog ...