Blitz is a PHP templating engine with two main features:

Fast.  Blitz is written in C and built as PHP-extension which makes it one of
       the fastest template engines (you may see the benchmarks section below)

Clear. Blitz has quite simple and clear syntax and makes developer to build
       compact and easy-to-read-and-support code even for applications with very
       complex presentation logic

WWW: http://alexeyrybak.com/blitz/blitz_en.html