Thanks for responding ,
My project has 61 .cpp files and about 17,000 lines of code, but I’m usually only working in a single file at any one time. I tried making edits to several .cpp files and the build still focused on one core.
I removed the BuildConfiguration.xml file that I edited earlier, from C:\Users\User\AppData\Roaming\Unreal Engine\UnrealBuildTool\ but no change.
I notice on my quad core laptop, the same project will compile in about 59 seconds (24% cpu utilization across all four cores) after editing a single .cpp.
On my 14-core i9 it takes about 39 seconds (7% cpu utilization - actually 1 core at 100% utilization). I would expect the 14-core to be much faster than the 4-core, but also the 4-core laptop should be a lot quicker than 59 seconds I would think. Both are 16gb ram, SSD drives.
I can’t help but think I’m missing some compile flag somewhere. My laptop and workstation are both running vanilla 4.21.2