One of the celebrated improvements in Lightroom CC is the faster performance, said to be up to ten times faster, thanks to the software’s ability to leverage the graphic processor unit (GPU).
A few days after the official release, however, an Adobe engineer shared additional information regarding GPU acceleration and turns out it might not be all that great. Not right now, at least, and not for everybody.
At the moment GPU acceleration is only available in the Develop module, and even then not all editing controls enjoy it.
Additionally, while GPU implementation offers no advantage for some functions, certain others will actually take longer with the acceleration enabled.
This information also applies to Camera Raw 9.0 for Photoshop/Bridge CC.