There's many more improvements to be made in single threaded performance, including things like JIT. Future improvements are complicated, they won't be a free

There's many more improvements to be made in single threaded performance, including things like JIT. Future improvements are complicated, they won't be a free lunch like this first round has generally been. My feeling is that things like JIT and nogil will start out as optional and work their way into the ecosystem over time where the performance implications are less severe for the general use case.