Darktable – Windows performance

OK, did some tests on my son’s recently built PC with Ryzen 5 7600 andd RX 7600.
CPU only: 11.2 sec
CPU+GPU: 5.1 sec
It is slightly faster card than my W6600, but still this result is far from 2.8 seconds results of benchmark on slower CPU (Ryzen 7 2700x) and the same GPU (RX 7600) from mentioned by me list:
GPU benchmarks in darktable (dartmouth.edu)
I ran some OpenCL benchmarks using Compubench and turned out in most of operations my card is about 2x as fast as my previous RX 570. In Darktable difference is maybe 15%.
I tried also some older versions of AMD drivers with little changes. So to me it seems Windows version of DT is for some reason slower when using Open CL than on Linux. Test using only CPU are on par with similar hardwa running Linux. It could be also a problem with Windows 11, which I have on my and my son’s PCs, but mentioned OpenCL tests do not show this. In the free time I’ll try to install Ubuntu on another disk on my PC to do the same benchmarks.