Lifehacker recently published the results of some informal speed and performance tests that were performed on some of the top non-Microsoft browsers. Chrome 4.0, Firefox 3.5 and Opera 10 were submitted to a series of 3 tests which measured Boot up and Page Loading (won by Chrome), Javascript execution speed (again won by Chrome) and Memory Use (which Firefox won). The results were very close and the tests were unscientific, but it makes for an interesting comparison. Read more about the browser tests at the Lifehacker website.

See this earlier post for more details about the recent Opera 10 release.