Following another bout of controversy about NVIDIA's Gameworks program, AMD is promising improved beta drivers for the games in question, and have posted Important Information about AMD Catalyst Driver Support for Project CARS and The Witcher 3: Wild Hunt (thanks HARDOCP). Here's word:

AMD is committed to improving performance for the recently-released Project CARS and The Witcher 3: Wild Hunt. To that end, we are creating AMD Catalyst™ 15.5 Beta to optimize performance for these titles, and we will continue to work closely with their developers to improve quality and performance. We will release AMD Catalyst™ 15.5 Beta on our website as soon as it is available.

In the meantime, users experiencing performance issues with the "HairWorks" feature in The Witcher 3: Wild Hunt are encouraged to enable the below settings in AMD Catalyst™.