Edit: some guesses seem relevant, but I just saw there is another thread where more people have done more testing, and seems like CPU clock is most important..anyway, read the other thread instead of my ramblings below =)
Interesting...I have evo ssds as well (program and cache on one and images on another), but I get about 2s for full view render of 36mp images with the optics pro 11 default preset, have 32gb ram and a i6700cpu, so ok hw but not extreme. The screen is 1440p.
I had a quick look at cpu usage during the full view rendering, and it seems to max out at about 50%, when half screen for dxo, but 75% when going full screen, so maybe there's some connection between screen resolution and how much cpu can be used due to how the software is coded (when it comes to parallel processing)?
So I'm thinking, or rather speculating, that if op has a 1080p screen, and software caps out on about four cores for that size of rendering, and the cores are running at 2ghz vs 4 for me, and 42 vs 36mp, maybe that's part of the explanation? Perhaps memory clock speed is also relevant of cpu is used for the rendering (GPU seems not to be used a lot what I can see during the basic open-next-image.. also assuming storage is largely irrelevant as someone noted).
But as I said; just a bunch of guesses above, so don't take anything as a truth...