Larry, a nice one.
Here is the thing about realtracks generation from my experience.
I ran some tests from a spinner hard drive and 3 different SSDs (different manufacturers/speed)...
If you get an older Samsung 860 evo (ssd), or similar or above in specs, I doubt there will be any significant improvement in time it takes for RT/RD generation.
I argued for some time, that in my opinion, if PG team makes an option of loading RT's you are working with directly to memory, it should speedup things at least double fold. Otherwise, spending money on top of the line SSD is like putting a Maybach engine on farm tractor.... Just my opinion