Apply Profile-Guided Optimization to the project

[zamazan4ik]

Hi!

Profile-Guided Optimization (PGO) could help with improving the performance of the tooling for the Gleam project: compiler (like Rust Lang or C++), language server (like rust-analyzer or clangd).

Since the project is written in Rust, you can try to use cargo-pgo. More information about PGO applications on real-world software you can find here.

[lpil]

Hey! While this is cool I think we don't have any performance issues currently that warrant more work, and there's many simple low hanging fruit we can go for first, such as switching from reference counting to arenas for AST, types, and codegen, multi-threaded compilation, lazy loading modules, and regular profiling to identify mistakes in the code.

[zamazan4ik]

But I think (that's just my feeling without actual knowledge of the codebase but with a knowledge how to apply PGO on Rust projects) PGO is easier to apply compared to "manual" changes to the codebase that you mentioned above. Also, PGO is still useful even if you apply all "log-hanging" optimizations.

[lpil]

Totally! It's more that I have very limited time so would not be able to explore this until much later, and then only when we have a need to improve performance.

[lpil]

Closing this as it's not to be worked on now, we can revisit this in future when optimal