Reducing Next.js Time to First Byte by 36%

A slow server response does not identify its own cause. The delay can come from database queries, external services, computation, or work that should happen after the response.

I traced the request path and separated work required for the user response from work that could run asynchronously.

I moved suitable work to asynchronous jobs and simplified the critical request path. This reduced waiting without hiding a required dependency.

Background work needs its own failure handling and observability. Moving work without those controls only moves the problem.

Not every slow route should use a queue. The correct design depends on consistency needs, user feedback, retries, and the cost of delayed work.

The 36% result belongs to this production system. A new project needs its own baseline and measurement.