We are using opcode caching.
"PHP 5.4.13 with APC, PHP-FPM, nginx"
http://www.techempower.com/benchmarks/#section=environment
We've had a lot of input from the PHP community about setting up the PHP tests properly, but if you have a suggestion for an improvement we'd appreciate it.
Memcache isn't used because none of the tests are caching database results. A later test will use caching.
We'd be happy to include Yii. Submit a pull request. :)
