It will be nice to compare with dual-channel RAM interleaving on/off, and Hyper-Threading on/off.
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Also using cache or not?
Without caching, itās quite sure that performances will decrease 
But you may try, this world of ours is full of surprises!
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As an example of unexpected, I remember an attempt on a dual E5xx Xeon with more than 256GB RAM (quad channel) was not as fast as a simple i7 with 64GB.
Culprit: the NUMA interleaving. Also Ubuntu is not very good at SMP tuning, should have needed some kernel tuning.
I also have a project to attempt building on a ppc64 (IBM E9xx Power9), but this will take time and I donāt have much for now 
The conclusions (at least for my hardware or similar hardware):
(I) Fast M.2 SSD does not improve build performance over SATA/600 SSD
(II) Cache is slightly decreasing build performance
(III) Without SMT/HT: performance decrease about 15%
(IV) More RAM: minimal improvement
So a fast CPU with many cores is a plus, cache and more RAM than 32GB have minimal impact.
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Would be interesting if and how 128GB and a ramdisk perform
That match my feelings: compiling speed is mostly related to pure, raw, computing performance.
Thanks @ronnz98 for your work and feedback 
Would be nice from compiler to be able to use GPU!
I suppose this would not have much of an impact
or if money does not play a role:
https://www.anandtech.com/show/21124/amd-ryzen-threadripper-7980x-and-7970x-review/11
here some 2022 benchmark numbers and core/mem-ratio +storage behaviour comments - https://groups.google.com/g/android-building/c/Q76dYAhwrkA
Didnāt yet build on a machine with that many core/threads (>32), so I maxed them out before anything else. Core to mem ratio as 1:2 feels true. Cache on nvme didnāt matter much. With 4-cores, you can even build on sata hdd to keep them cores busy.
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If price isnāt the limit, I personally go for https://ark.intel.com/content/www/us/en/ark/products/series/232643/intel-xeon-cpu-max-series.html
In the past, I built some with a bi-Xeon Gold 5xxx (2 * 32 cores), came to the conclusion that a high number of cores (or sockets ?) may need some OS or compiler tuning ā¦ I saw performance increase staling with more than ~40 cores.
When it comes to high level performance, with the costs associated, I now prefer to use cloud VM with Docker method. It can be up and building within minutes, and my home keeps silent 
For example, CCX63 at Hetzner, costs less than a good beer to produce a ROM image.
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ah cool. When I have too much money I in the future I will setup a build monster 
Just saw a good offer if anyone is interested:
https://www.galaxus.de/en/s1/product/intel-xeon-gold-6142-lga-3647-260-ghz-16-core-processors-6417473
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and btw if anyone in Germany is looking for an upgrade, I sell my old hardware as upgrade kit:
CPU: AMD Ryzen 9 5950X AM4
RAM: Kingston FURY DIMM 64 GB DDR4-3600 (2x 32 GB)
CPU Cooler: be quiet! Shadow Rock Slim
Mainboard: AM4 ASUS PRIME X570-P
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