Environment Activation Process Optimization

[priyaa1110]

I've been exploring Pixi's codebase and noticed the environment activation process in src/activation.rs. It's an interesting component that handles environment setup, shell configurations, and caching.
I'm thinking about contributing some optimizations to this area.
Before I start, I would like to know:

• Which parts of the activation process need optimization the most?
• Are there specific performance issues users have reported?
• Should I focus on one area or take a broader approach?