Learn How to Lower Heroku Dyno Latency through Persistent Connections (Keep-alive)
04 Nov 2025Before the latest improvements to the Heroku Router, every connection between the router and your application dyno risked incurring the latency penalty of a TCP slow start. To understand why this is a performance bottleneck for modern web applications, we must look at the fundamentals of the Transmission Control Protocol (TCP) and its history with HTTP.
Keep reading in the heroku blog post.
