When I first started building SaaS products, I relied heavily on traditional serverless functions for my API routes. It was the default choice. You write a function, deploy it, and call it a day. But as my user base started to spread across different time zones, I ran into a frustrating reality: my API was fast in the US, but painfully slow for users in Europe or Asia.

I was struggling with cold starts and network latency, especially for endpoints that needed to fetch external data. Every time a user ran a site analysis, they were waiting for the request to travel across the world, hit a server in us-east-1 , and travel back. So I decided to build something that handled this architecture out of the box, which eventually became the foundation for my TypeScript-first SaaS starter kit, SaaSLaunch.

The Latency Problem in Global SaaS

When you are building a SaaS, performance isn't just a nice-to-have; it's a core part of the user experience.…