Improve the way the Backlog is loaded for better performance and/or rendering of a large number of items

Problem Definition

When there are many issues on the board, the load time is pretty bad.

Edit: incorporating performance for epics and versions

Suggested Solution

We could 'paginate' the results to improve the experience for example. Ie. Once a user scrolls down, we can load the other issues which are ranked below the bottom of the screen.

Notes

• Agile pefromance logging - you can enable DEBUG for com.atlassian.greenhopper.performance which will give you breakdown for slow request, example of output:

  /// Full line: 2018-06-13 21:59:20,824 ... /rest/greenhopper/1.0/xboard/plan/backlog/data.json [com.atlassian.greenhopper.performance
  
  2018-06-13 21:59:20,824 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.search  8ms
  2018-06-13 21:59:20,841 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.searchAndSort  13ms
  2018-06-13 21:59:20,841 ... /data.json [com.atlassian.greenhopper.performance] collectIssues (search and callback)   15ms
  2018-06-13 21:59:20,841 ... /data.json [com.atlassian.greenhopper.performance] collectIssues (callback only) 8ms
  2018-06-13 21:59:20,844 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.search  2ms
  2018-06-13 21:59:20,850 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.searchAndSort  2ms
  2018-06-13 21:59:20,850 ... /data.json [com.atlassian.greenhopper.performance] collectIssues (search and callback)   3ms
  2018-06-13 21:59:20,850 ... /data.json [com.atlassian.greenhopper.performance] collectIssues (callback only) 1ms
  2018-06-13 21:59:20,852 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.search  1ms
  2018-06-13 21:59:20,862 ... /data.json [com.atlassian.greenhopper.performance] SearchProvider.search  1ms
  

  • note: collectIssues (callback only) 8ms