It's not just them, I have a 7940X as well on a rampage VI extreme with 960 pros in nvme and an 850 evo and things (aside from windows on x299) take a long time to load, transfers to/from flash drives is slow compared to other builds, and the PC in general is pretty laggy. I'm about to reinstall windows, even though I just installed it a few months ago. I run latencymonitor on multiple systems and it keeps telling me my system is having trouble handling real-time audio and other tasks due to buffer underruns and drop outs, with levels that go fairly high compared to other builds I've done that don't go up at all (an i3 8100 and an i7 7700K).
Pretty pissed, especially since the latest BIOS releases (1201 & 1301 released 3/20/18) caused blue screens on boot up too. This whole system has been nothing but buggy since I've built it. Grrrrrr