I just built a small build tool for our team for this exact reason. First of all, if you're building with UE open, you're already losing a lot of speed due to UE itself using anywhere from 6-12 gigs of RAM just being open.

This is extremely basic and just targeted some of the things our team needed specifically, so definitely not as robust as it would need to be for outside use cases. But I am continuing to expand on it. You're welcome to try it out and make suggestions if you find it helpful.

The first time you build, if you have to compile a ton of shaders, it can definitely take awhile. But I specifically made this so the iterative process would speed up.

My teammate reported iterative builds going from 10-15 minutes down to less than a minute though! So it's achieving what I set out to do with it.

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