The new 378.13 driver cause constantly 100% load at one of eight core of my CPU when running FIrefox-52 (52.0.1, 52.0.2) with turned on in Firefox hardware acceleration (OpenGL). This load start after i opened 3-5 different urls in different tabs. Even if you open one tab - this causes an excessive peak, but a short-term load on the CPU, which is not observed with another version of the driver (375.39).
There is no problem with 375.39 driver - very small CPU consumption all time. This behavior tested with clean profile of Firefox, with self-compiled Firefox and Firefox-bin from official Mozilla site and from Gentoo portage.
Also Chromium with hw acceleration no cause this problem.
Gentoo X86_64, GeForce 1050, AMD FX-8320E.