cache path cwd

[adhami3310]

apparently this is somewhat slow

[codspeed-hq]

CodSpeed Performance Report

Merging #5948 will not alter performance

_{Comparing cache-path-cwd (d240cb3) with main (982d2fa)}

Summary

✅ 8 untouched

[greptile-apps]

Greptile Overview

Greptile Summary

Optimized get_app() function by caching the current working directory path.

• Created new _cwd() helper function decorated with @once to cache the result of Path.cwd() on first call
• Replaced direct str(Path.cwd()) call with _cwd() in get_app() to avoid repeated filesystem calls
• This is a targeted performance improvement for a frequently-called function where the working directory doesn't change during execution

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Simple, focused performance optimization using an existing proven pattern (@once decorator). The change only caches an immutable value (cwd) that doesn't change during process execution, making it safe and correct.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
reflex/utils/prerequisites.py	5/5	Added _cwd() helper with @once decorator to cache Path.cwd() result, replacing direct call in get_app() for performance optimization

Sequence Diagram

sequenceDiagram
    participant Client
    participant get_app
    participant _cwd
    participant Path
    participant once_decorator
    
    Client->>get_app: get_app(reload=False)
    get_app->>_cwd: Call _cwd()
    
    alt First call
        _cwd->>once_decorator: Check cache (unset)
        once_decorator->>Path: Path.cwd()
        Path-->>once_decorator: Current directory
        once_decorator->>once_decorator: Cache result
        once_decorator-->>_cwd: Return cached value
    else Subsequent calls
        _cwd->>once_decorator: Check cache (set)
        once_decorator-->>_cwd: Return cached value
    end
    
    _cwd-->>get_app: Return cwd string
    get_app->>get_app: sys.path.insert(0, cwd)
    get_app-->>Client: Return app module

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