The PLB is software that allows graphics performance to be measured in the same way across different vendors' proprietary application programming interfaces (APIs). Its availability under OpenGL will make the PLB accessible to a wider range of graphics users and vendors.

A PEXlib sample implementation of the PLB is also available publicly. Current members of the PLB project group include Digital Equipment Corp., Fujitsu, Hewlett-Packard, IBM, and Sun Microsystems.