Making ast.walk 220x Faster

Software Development, Code Editors & IDEs, Performance Engineering(reflex.dev)view on HackerNews
ast.walkperformance optimizationPythongeneratorsyield syntaxRust bindingscode generationReflex

Author: palashawas

Date: 6/16/2026

Article Summary:
The author describes their efforts to improve the performance of the ast.walk function in Python, which is used in their AI-powered code generation tool, Reflex. They identify the main bottleneck as the use of generators and yield syntax, and present several optimizations, including inlining, removing unnecessary function calls, and using Rust bindings to write native machine code.