Overall, and taking the performance of the beta versions into consideration, the browser performance rankings are as follows: Firefox and Safari in a clear lead ahead of Opera and finally Internet Explorer. Firefox 3, due in June, promises very good performance and efficient memory usage. No browser used less memory to open multiple sites than the Beta 5 version of Firefox 3, and only a few sites failed to display correctly. Safari and Opera, however, are more likely to exhibit incompatibilities.
As with all benchmarks we link to on OSNews: do with it as you please.