>>15-17
To be clear >>13 is not saying the same thing as >>14. Clojure is clearly very fast within its problem domain, but what makes fast concurrent networked applications is not necessarily the same thing that makes fast single user applications. While avoiding mutation would be a boon to performance of the former it's detrimental to the performance of the latter. While startup time is irrelevant for distributed systems with uptime in the years, it is more relevant for (especially smaller) single user applications (uptime might have been fixed with Graal, I'm not sure). Similarly, low level primitives are rarely relevant to concurrent networked applications, but can often come in handy when interacting with a single system.