Now that ATi/AMD have included AIGLX support in their linux driver, Phoronix wants to know which driver provides the best AIGLX performance: the ATi/AMD one, or fglrx?

"However, one of the complaints about the fglrx implementation of AIGLX is that in the 8.42.3 driver, some are encountering slow performance in Compiz / Compiz Fusion. We have taken an ATI Radeon X800XL 256MB PCI-E graphics card, which is supported by both the Radeon and fglrx drivers, and have compared their Compiz performance in a few different scenarios."