I'm on a 3-year old MacBook Pro with 16G and apart from the problem of stalling with rotating beachball and sticky brushes about six months ago, it is working pretty well. That was also th 2019 version. I had my issues with Photo Raw a few years ago, but I think it gets way better with each new release and I'm pretty happy with PR2020. It helps that they have cleaned up their interface and I'm getting a lot more proficient with using the software.
It's interesting to me that subscription Adobe Camera Raw and Photoshop run flawlessly on my current computer while On1 2019 almost doesn't work at all. I asked for help from On1, received some suggestions and applied those suggestions without much difference. I had always heard that the Adobe CC package was a resource hog but it doesn't come close to what On1 demands. And besides that, they keep asking me for more money for (it is claimed) new and better updated versions (ie. Photo Raw 2020).