The Chrome performance recording can help us debugging the problem.

See https://developer.chrome.com/docs/devtools/evaluate-performance/reference/

Steps:

• 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