dompdf/dompdf — pull request #799 by olombard (2014-03-17 21:26:46+00:00)
Title: Only one instance of each Positioner type

Instead of giving each frame their own positioner object, they only get a reference to the applicable positioner type. This is handled by \Dompdf\Frame\Factory.

Over the sample test files (www/test/*.html), this results in a 5% speed improvement but surprisingly has no effect on memory usage.