C1 10 is much slower that 9.3 on my system (MacPro D700 12-core, 64gb ram), going from image to image.
There is a noticeable delay between pressing the arrow key and advancing to the next image. C1 9.3 instantly advances to the next image, and then takes an instant to render. C1 10 won't advance instantly, but doesn't have the render lag after the image appears.
I prefer the former, as it is easier to edit this way. And the delay between pressing the arrow key is frustrating.
Hopefully this gets fixed!
It is not slower on my 2016 27" iMac, and it may be a tiny bit faster but not much if any. I did notice what you are seeing about advancing through images and while I hate to be cynical, my first thought was that this was just a gimmick to make it seem faster.
I upgraded on the prospect of more speed. I'm usually not an immediate upgrader, so shame on me this time as I just don't see it.
I am looking forward to the various sharpening features.
jwsti, not sure which Mac you are using but at this point I would not upgrade solely on the prospect of improved performance.