I’m considering Duct for an upcoming project and I’m wondering if there are any performance concerns I should be aware of. I haven’t seen any comparisons with other frameworks. Moreover, I haven’t decided on a routing library yet (open to suggestions), which I’m sure is the biggest consideration here. The project isn’t particularly performance sensitive, but just checking.

You can use Duct regardless of which routing library you choose (default uses compojure or ataraxy); I personally use it with Pedestal and it’s routing libraries. So there’s no “lock-in” that you can’t get around if you later have metrics showing that routing is your bottleneck.

Integrant is a library for connecting arbitrary system components together; Duct adds some conveniences around Integrant, and provides various modules for quickly adding components to the system; neither dictate what components you must use.