Or even have a dedicated build server/farm with object caching. At some point building on your own machine is not a great solution.
If you're building Apple projects, it might be hard or impossible to offload that to other operating system.
GP said they were using a Xeon workstation, so I assumed it's not an Apple offering already.
iMac Pro has a 18-core Xeon W option.
I guess I meant, usually people with Mac systems call them a Mac of some sort, not just a generic "Workstation".
If you're targeting Apple platforms with your builds, just how does a Threadripper workstation address the problem? (And don't say Hackintosh...)
https://github.com/tpoechtrager/osxcross/
It may not be a viable solution for every project, but it does work for many.
I assume there's I/O bottlenecking in there somewhere, but for the rest, surely you're not 100% pegging all 16 cores all the time, but more parallelism would still benefit you to a certain extent... While not costing $6k+ for a base 8 core machine.