are performing within expected range / speed. Surprisingly other application like compilation on gcc / msvc / rendering with blender / cinebench etc. This happens under 1 sec mark but it's annoying. opening notepad++ and I see white window for a fraction of second and then all widgets gets painted. There is also an issue with slow responsiveness of other application, Open / Save file dialogue is slow, general window painting is also slow, not painting itself but there is a delay that gives an effect of that slowness, i.e. Also CPUZ score is higher when using 18 threads instead of, all by default so in this case, 20 threads. This was also reproduced on my main system (Windows 1709 FCU) when running CPU-Z benchmark with 18 threads and invoking | opening by 'WinKey+E' explorer response much faster then without CPU-Z. Any correlation that I seen is CPU utilization. I wanted to test if my hard / ssd drives maybe cause this issue, so I did disconnected all of them and kept only one SSD during tests - no correlation. My other system (i7-4770 MSI GTX 970 on HDD) running same windows version works fine, very fast responsiveness.

Reason why I did this because my main system is Windows 1709 (Fall Creators Update) that's running on Samsung 860 Pro NVME drive exhibits exactly same behaviour. These videos presents Windows 15 and are recorded after fresh install on Samsung 850 Evo 256 GB SSD. Video presenting issue, with strange behaviour depending on CPU load: Windows explorer is slow when opening (and working afterwards) multiple instances, i.e. Link to MS tech forum, much more info then in this post, I keep this one minimal.

I already posted (few months back) this question on MS tech forum but no one could give me solution for issue. I do have issue with speed of Windows 10 explorer (and other apps also, but less noticeable) on x299 platform.

Cpuz hardware monitor