Here's a quick, rough look at the speed of the Tokyo Tyrant extension for PHP released by Mikko 2 days ago. I am using it as an on-memory hash. Profiling done with xdebug on PHP 5.3.0.

He includes two shots of the output from a sample run with PHP 5.3.0 - one showing a simple execution of a get and put for a set of values and the other comparing the simplicity of that to a more complex request structure for this implementation of a Tyrant interface.