Good news! Worklogs - Time Tracking and Reports team has just released a new version, and since you use Jira Server you can decide to upgrade at any time! All that is needed is a click of a button in the Apps management screen on your instance!
Improvements:
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Enhanced report performance when processing a large number of issues.
Bug fixes:
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Resolved an issue where the report occasionally failed to load and the progress bar exceeded 100%.