CentOS, Nvidia GTX 1070
Broken: 2.79 713027b8325 daily build, 2.8
Worked: 2.79b official
Short description of error
Rendering sss on gpu take more time in the daily build and 2.8.
This particular scene: 2.79b - 1:12, 2.79 daily build - 1:23
With more complex shading it was even 1:12 vs 1:38, and 1:42 on 2.8
Rendering on CPU is the opposite - faster in the daily build.
The settings are important. This behavior is only for:
branched path tracing
subsurface samples = 3
hdri as a light source (multiple importance is on)
And what's more, if you set the subsurface in the shader to 0, you'll get almost the same render time, but in 2.79b it'll have noticeably less noise.
Don't know if it's relevant and should i create a new report on this.
Exact steps for others to reproduce the error
Open the scene.
Repeat in the different versions of blender.