In fact a routing layer designed for non-blocking, evented, realtime app servers like Node and its ilk

from James Somers (Ft. Andrew Warner, ATodd, Chrissy & LEMON) – Heroku's Ugly Secret on Rap Genius

Meaning

I have never managed a node deployment on Heroku, but I think their current routing strategy is also worse for node, as you’re still going to prefer that an idle dyno receive a request vs an in-use dyno. Anything CPU-bound, rendering a template, for example, will still slow down the next request coming in.

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