I'm Romi, a designer from Jira Software (nice to meet you!). We're currently working on ways to improve how administrators manage custom fields and their performance impact in Jira. We have an early prototype of a new app that we'd love to get your feedback on. To say thanks for helping out, we're also offering amazon gift cards.
If you can spare 45 minutes in the next week to speak to us and test out the app, drop me a line - firstname.lastname@example.org.
Looking forward to speaking with you,