The Chrome performance recording can help us debugging the problem.
- Open Chrome and start from an empty page
- Show the Developer Tools, Menu > View > Developer
- Open the Performance tab and click the record symbol (left)
- Go to your Jira / Confluence / Bitbucket page and perform the actions to reproduce the problem
- When you are done, stop the recording and save it (right-click)
- Upload the recording file to the ticket