Complex CAD is extremely demanding on CPU hardware. The tree is built sequentially and the math is all single threaded. Once CAD gets past a certain threshold the software needs to start tuning the way the Kernel works. The regular settings optimised for throughput and latency become a problem and the software needs away to change this. I’ve been messing with the Linux CPU scheduler to try to improve performance for FreeCAD designing complex assemblies on an older machine. I finally gave in and ordered another machine, but am still curious about CPU schedulers in general. I don’t know how other software accomplishes improved performance on the hardware. I can only speculate, but I am willing to bet there are methods used to alter kernel parameters like the CPU scheduler in programs like Solidworks. The way these things are done is probably not portable to any other kernel.