by Ryan Smith.
Also, here is a blog post from a Microsoft developer, highlighting the improvements in PHP 5.5 and the performance gains with Zend Opcache over Wincache:
"Opcache significantly increases performance over PHP 5.4 with WinCache, anywhere between 25-152% increase in performance on IIS against the same applications."
http://blog.syntaxc4.net/post/2013/06/20/php-5-5-0-for-windows-released.aspx