Well, lot of things can influence here. Multithreaded build, PGO, or even the different access order of the hash table inside the code optimizer can be a factor

Well, lot of things can influence here. Multithreaded build, PGO, or even the different access order of the hash table inside the code optimizer can be a factor. Things are getting probalistic and thus somewhat nondeterministic: the build itself is nondeterministic but the runtime/final execution is deterministic