PyPy: Speeding up Python with Just Python

When we talk about more performance of our Python microservices, there are most heard options to rewrite them in -asm- Go, Rust, Node.js, etc. What does this mean for a Python-only team? Hiring an expensive developer for only one task or sending a Python developer to learn some other language and diffuse his skills into two stacks. What if you can increase the performance of CPU-bound operations without changing the stack or expanding the team?