Although premature optimization is the root to many evils, it would be of great benefit to us to start monitoring the current performance of the game and the performance of things which are already implemented
The ideal outcome of this task would be a simple command that users could run and receive a report about which functions and which calls take up how much resources in the system.

I reccomend cargo flamegraph for monitoring performance: https://github.com/flamegraph-rs/flamegraph