My 970M doesn't seem to be performing much better than my integrated graphics.

Whilst I now have PD14 using the GPU (thanks to the advice in this thread http://forum.cyberlink.com/forum/posts/list/75/46836.page), the load on the GPU seldom goes above 6% according to Nvidia Inspector but the Preview (with Preview Quality set to "HD Preview Resolution") quickly becomes very juddery and out of sync. Load sits around 4-6% on the GPU and the CPU fan kicks in quite quickly.

The point I'm making is that it's the same with integrated graphics, so I can only imagine that PD is still not making very efficient use of the 970M. Do you guys find that to be the case? Any ideas on getting PD14 to make better use of the 970M, especially with regard to Preview?

I should say that I have Enable OpenCL and Enable hardware encoding checked in preferences. Schenker XMG P506 15.6" Pro
Intel i7-6700k 2.6 Ghz
Samsung 512GB m.2 SSD
16Gb RAM
nVidia GeForce GTX 970M
Windows 10
PowerDirector 14