A few weeks ago we started getting reports from a few users that some (but not all) Select List fields were taking a long time to display their options and/or to let you select from the list that's being displayed. Essentially the browser hangs momentarily. Sometimes, an error dialog will appear with the option to click Wait to continue to wait for it to completely load.
Some users see this issue in both Edge and Chrome, while some see it in Edge but not in Chrome. Other users, including myself, don't see any problem -- regardless of browser, the dropdown fields work fine.
We are currently on Jira Server 8.6.1 and there haven't been any significant changes to our instance in some time. The most recent change was to upgrade the version of Apache Tomcat within the 8.6.1 install in order to remediate known vulnerabilities (this is a somewhat routine activity for us and has always worked without incident).
Any idea why some (but not all) Select List fields would be slow to respond when a user clicks to see the list of options? Since it only happens for some users, it seems like it might be external to Jira but haven't identified any common trait among the users who see the issue.