Slow response from inf-clojure (completions, arglists, ...)

Don't want to solution here, but it seems like `inf-clojure` got slower at responding in completions and eldoc/arglists.

It takes a while to see the completion even if it is very minimal, this must have been introduced with the comint buffer redirection. Probably an alternative implementation of `inf-clojure--process-response` can be attempted.