@valerauko Now that is interesting to me. For HTTP stuff, nothing Clojure-core should have any iimpact at all. I would expect issues to either stem from the Java server undergirding it (usually Undertow) or from whatever library is doing your routing. Reitit is the current top-dog in routing and is very performance-concious, eg https://cljdoc.org/d/metosin/reitit/0.5.15/doc/misc/performance