Issue Summary

When clicking on a card in the backlog of Jira 8+ the card is slow to change state (XHRReadyStateChange) so that it can be moved. The response becomes slower relative to the number of cards in the backlog, but can be replicated with about 100 cards.

Environment

Jira 8, Chrome 75. This can not be replicated in any other browser.

Steps to Reproduce

1. Create a Software project.
2. Create 100+ issues in the backlog.
3. Navigate to the board > backlog.
4. Attempt to click a card and rank it.

Expected Results

The card can be moved immediately.

Actual Results

There is a delay between the click and the time that card can be 'picked up' and dragged to a new location.

Notes

• Observing the network traffic in the browser, the GET request to URL http://localhost/contextpath/rest/greenhopper/1.0/xboard/issue/details.json?rapidViewId=1&issueIdOrKey=BLAH-32&loadSubtasks=true&_=1562013311017 is slow.
• A screen recording of the behavior can be viewed here: https://cl.ly/b83d71cde59c/Screen%252520Recording%2525202019-07-01%252520at%25252002.54%252520PM.mov

Workaround

Use a browser other than Chrome.