The overhead of the GIL is probably insignificant for a single threaded python program, in part because the GIL is very coarse grained. Go uses (afaik) finer gr

The overhead of the GIL is probably insignificant for a single threaded python program, in part because the GIL is very coarse grained. Go uses (afaik) finer grained synchronization that therefore has more overhead. Also since python is slower anyway the relative cost of locking is much smaller than in the faster Go.