Lazy Imports in Python 3.15 – Faster Startup Times
PEP 810 brings explicit lazy imports to Python 3.15. Modules are only loaded when first used, dramatically improving startup time for large applications and CLI tools.
Usage Example
import lazy
from heavy_module import expensive_function # not loaded yet
if condition:
result = expensive_function() # loaded here
Best Practices
- Use for optional dependencies or heavy libraries
- Great for CLIs and web frameworks
- Combine with __future__ imports where needed
Conclusion
Lazy imports are a game-changer for Python performance in 2026.