My main PHP site, which is pretty big and even a bit messy:
Requests per second: 56.20 [#/sec] (mean)
WordPress with Twenty Eleven:
Requests per second: 1.57 [#/sec] (mean)
For fun, an index.php that just echos “hello world”
Requests per second: 1183.78 [#/sec] (mean)
heh…
They are on the same servers. Very strange!