building all the targets is slow

and this solution:

I'd tell them to go back for more data, because that's just not enough information. 

Why's it slow? Where's the time going? How many files, on average, are part of an AGESA build vs., e.g., a newer chromebook build? How big are they? How many files do they include? 

But sawing off one's leg because it hurts seems like a rushed decision.

So, what's going on here? Can we get a bit more specific about the problem, and a bit less drastic about the solution?

ron