Okay, it's come down to this. I ordered a 1Tb SSD and the usual cloning cable plus 2 1/2 to 3 1/2 adapter today. I had debated even before the issue with over achieving ON1 Photo Raw whether to replace the C: drive with an SSD. I figure I'll see what difference in performance I see. Quite honestly, I'm not that optimistic. One of the posters suggested it's not an IO problem, I tend to agree but am interested enough to try. It's less than $150 for a Crucial and stuff through Amazon. Then, I fully expect to have to bite the bullet for a new GPU. Going back to my prerequisites, bus powered only (no hookup for a second fan), 4gb, and less than $200 eliminates a number of suggestions even though I'm really appreciative. Price begats performance, that I'm aware.... The 1060 GPU is in the $300 plus ballpark. I couldn't find a 1060 ti version. That sort of pushes me back to its predecessor, the 1050 ti single fan version with 4gb onboard, which is available for less than $200. I'll probably give that a shot with fingers crossed. If that doesn't help.... well, there are only a couple ways to go, new computer (no!!) or go up to a more expensive card.

Okay, it's come down to this. I ordered a 1Tb SSD and the usual cloning cable plus 2 1/2 to 3 1/2 adapter today. I had debated even before the issue with over achieving ON1 Photo Raw whether to replace the C: drive with an SSD. I figure I'll see what difference in performance I see. Quite honestly, I'm not that optimistic. One of the posters suggested it's not an IO problem, I tend to agree but am interested enough to try. It's less than $150 for a Crucial and stuff through Amazon. Then, I fully expect to have to bite the bullet for a new GPU. Going back to my prerequisites, bus powered only (no hookup for a second fan), 4gb, and less than $200 eliminates a number of suggestions even though I'm really appreciative. Price begats performance, that I'm aware.... The 1060 GPU is in the $300 plus ballpark. I couldn't find a 1060 ti version. That sort of pushes me back to its predecessor, the 1050 ti single fan version with 4gb onboard, which is available for less than $200. I'll probably give that a shot with fingers crossed. If that doesn't help.... well, there are only a couple ways to go, new computer (no!!) or go up to a more expensive card.

I use ON1 Photo Raw 2019.5 (release of today 13.5.1.7136) and have been plagued by slow rendering of raw files (most are about 24-26mb) ever since the initial bug infested version of 2019.5. My computer is a 5 yr old Dell XPS 8700 running a quad i7 processor with 16gb memory along with a NVIDIA GeForce GT 635 GPU. Other issues aside, I contacted ON1 tech support about the slow rendering and a couple other sluggage performance gripes. After a pretty lengthy discussion where the tech reported that he couldn't duplicate my problems, he suggested that my "older" computer's GPU was likely a contributor to the rendering issue. ON1 puts a lot of burden on the GPU, so he said and then suggested I consider upgrading the GPU. Even though he didn't offer any specific recommendations, he did say that a gaming GPU was not necessary, but that I look for a bus powered card (single fan?), relatively low (<85w nominally) power consumption from my 460w computer power supply, 4gb of onboard memory, and support for OpenGL 4.0 or higher. I have the room in the chassis for a double width card but it can't be any longer than about 7 1/2 inches. I don't game at all and would ideally, given the age of the computer, like to keep the cost under $200. Since the XPS 8700 is not a gaming machine, should I also be concerned about heat buildup within the chassis? I have quickly found myself wrapped around the "too many choices" axle. Adobe has a web page where they list cards they have tested but provide no information on results. I did run across an article on "punchtechnology.co.uk that listed a number of cards, a one that I've looked at that appears to meet the suggest criteria, namely the NVidia GTX 1050 4gb.
So.... cutting to the chase, I'm interested in opinions from UHH users that have faced a similar dilemma and what their course of action was, particularly if you upgraded the GPU. Or... since my desktop has a few years under its belt whether I should learn to live with the performance as is?

Might also be an interaction between your PC and PP Software. I don't seem to have any "slowness" problems with my PC and Photoshop CS6 & ACR 9.1.1. My RAW files are typically 20-30 MB (from my 24 MP Camera, less with my others). My PC is similar in many ways (up and down). I have a Dell XPS 9800, 4 core i7 - 6700 (hyperthreading) 3.4GHz CPU, Nvidia GeForce GTX745 4gb GPU, 32 GB RAM, 1 TB 7200rmp HDD. My system is just slightly newer than yours, by a few months I think. Could ON1 Photo be a bigger Memory / CPU power hog than Ps? How home "memory" do you have allocated for ON1 Photo use on your PC. You can control how much "computing power" your machine can use for each program or application. I have mine set pretty high for several including and mainly Photoshop. MS-Office Programs are lighter on the system. In fact my wife's Dell Inspiron i5 Win 10 Pro machine seems to run MS-Office ap s faster than my Windows 10 Home machine. Odd.