The configurations can supposedly make a huge difference. However, I've yet to see a company where these weren't serious issues and I can only speak to my experience. If you're lucky enough to have a decent installation I'd recommend buying IT a nice lunch or something. A bad Jira setup is truly awful.

Cloud JIRA itself is slow, for what it’s worth. Seconds long RTTs — which make using a CLI to bypass the web UI pointless in my experience