Automation uses /rest/api/3/field API endpoint and it's extremely slow

Issue Summary

Automation uses /rest/api/3/field API endpoint and it's extremely slow for certain large customers. This slowness is leading to over all execution time of the automation trigger and in turn throttling of service limit(daily processing limit).

Steps to Reproduce

1. Setup a simple automation in large tenants(with high number of triggers/automations and issues) with trigger on comment/status change, with conditions to include check of issue type and action to send email/add comment.
2. You'll notice that it's taking long duration for execution to complete(10sec+)

Expected Results

Simple automation triggers should complete execution in less than 3secs

Actual Results

Automation is taking long duration for execution to complete(10sec+) and some cases close to 20sec+

In the automation logs, /rest/api/3/field is taking 3sec just to fetch custom field details/values.

Workaround

No workaround at the moment