If you have created these issue before installing my Gantt-Chart addon for JIRA, you have to click on the large button "generate planning dates ..." on the tab "Gantt-Chart" of the related project configuration within admin mode. Please verify, that your issue have set planned start/end date as this is a prerequisite to draw the related gantt bars (duration is not equal to effort, referencing PMI).
I have tested displaying 1000 issues of one large project, although loading needs some time due to the performance of my database server within the test environment.
In order to assist, I need some additional information:
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