Where does your startup time actually go?

📰 Medium · JavaScript

Understand where your startup time is spent in your JavaScript project using flame graphs and optimize index.ts re-export files

intermediate Published 1 Jun 2026

Action Steps

Run a profiling tool to generate flame graphs for your JavaScript project
Analyze the flame graphs to identify performance bottlenecks in index.ts re-export files
Optimize index.ts files by reducing unnecessary re-exports and minimizing dependencies
Test the optimized project to measure improvements in startup time
Compare the results with the original project to evaluate the effectiveness of the optimizations

Who Needs to Know This

Developers and engineers on a team can benefit from understanding and optimizing startup times to improve overall project efficiency

Key Insight

💡 Index.ts re-export files can significantly impact startup times, and optimizing them can lead to substantial performance improvements

Key Takeaways

Understand where your startup time is spent in your JavaScript project using flame graphs and optimize index.ts re-export files

A visual look at why index.ts re-export files are slow — with real flame graphs. Continue reading on Medium »