Hi,
I watched the "Taking PHP seriously" talk by Facebook engineer Keith Adams at StrangeLoop conf, and got interested to try out the HipHop PHP VM, which seems to be able to speed things up by quite a lot.
According to this blog post on the HHVM blog, it also seems to have gained very good unit test coverage for a lot of frameworks (Drupal and Lavarel to name two), so I was interested to hear if anyone has tried it with proceswire?
(Not that ProcessWire is slow in itself - the opposite! - but with all these high performing frameworks today like node.js and golang, it would be nice to see how far we could take PHP so we can use existing awesome PHP code like ProcessWire )