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try improve #259, @andiradulescu
I don't have access to github build machine, so I have my own mac with 8 cores, 16GB assigned to docker, here is the result, first run without cache, 2nd with cache.
master as reference
build #51 3.9G 29m2s
build #52 3.9G 5m45s
reduce packages AND parallelize kernel & system build
build #53 3.2G 25m8s
build #54 3.2G 2m53s
change kernel make to cpus * 1.5
build #55 3.2G 22m37s
build #56 3.2G 2m19s
try it with your build machine.