I've been using Opera 10 for a few days now and I reckon it's faster than Firefox. Also I believe it takes advantage of multi-core CPU's too. Sometimes it uses all 8 threads on my CPU...
EDIT: I have realised that its the browser plugins, like Flash and YouTube, that are multithreaded.
EDIT: I have realised that its the browser plugins, like Flash and YouTube, that are multithreaded.