Seems the same for me, Dell XPS 15 with integrated Intel HD630 and Nvidia Geforce GTX 1050. Here’s the output from the cltest:cltest.txt (53.2 KB)
Also, I noticed a bug regarding preview view.
If I watch an image in preview mode (pressing Z) after I have worked on it, the preview got some problems: the image is blurred, or the colors are inaccurate. Otherwise, freshly imported files are visualized in the right way. Any way I can help in that?