Comment by mmorearty

Scons is definitely slow in some scenarios. It has O(m * n) performance if a rule has m inputs and n outputs. I tdiscovered this when working with a code base that had a single rule with all .ts files as inputs, and all .js files as outputs. As the number of files we had got bigger, SCons got painfully slow. Of course we can rewrite our rules, but that shouldn’t be necessary, especially since it was quite hard to figure out why our builds got so slow.