Did anybody care to scan the source-code of PHP and provide metrics? I mean: it's nice to know that this runs X seconds faster on your machine than with the old version, but may not give me a good prediction for other software on other hardware. Only if you could provide the number of operations required for an average set of commands and show that there are Y percent less operations than before, this would give us a clear prediction of the average performance increase we are to expect from an upgrade on any software and any machine.