I don't really care about startup time personally but the linked page mentions "very low memory usage" which is quite a contrast with Clojure which seems to use insane amounts of memory for simple things.
Our product (https://kpow.io) is written in vanilla Clojure/Clojurescript, it will quite happily run with a 64MB heap for smaller workloads.
64Mb for a non-trivial full-stack enterprise-grade application with authentication enabled providing a rich UI and multiple asynchronous and/or scheduled background processes that monitor and manage Kafka resources. Sure we don't recommend running multi-cluster production workloads on a 64MB heap, but requiring further memory for real workloads has nothing to do with Clojure and we're a long way from 'insane' memory use, or doing simple things.
Maybe spending too much time in JavaScript-land has jaded my view of memory consumption.