Although i said that 32Gb ram is enough for most work i ran into some limitations with large files and 80 layer stacks so went up to 64GBRAM.
Ram is very cheap at the moment ( i paid 140€ for 2x 16GB) so it is not something to worry about.
i ran again the Photoshop Puget 0.8 test again ( the 09 did not work) and came to better results.
I noticed more cache helps, larger tiles helps and historie set to 1 helps if your system is limited in RAM.
the same system
originaly i had a score of 853 with 32GB ram
optimum i scored 923 with the same 32GB Ram system but tuned as above and Mojave instead of High Sierra.
with 64 gig Ram and 100 historie ( or 1 history) i got to a score of 973. ( enough ram for all the historie saved)
the 'weak' part of the hardware is now the GPU, but it is good enough for what i do.
BTW what the test does not include and adds significantly to the speed of Photoshop when using many large files is the storage solution and to disable compression in the preferences for tiff,psd and PSB.