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      When exporting large spaces as PDF, there's a big performance issue. When Confluence starts converting the collected pages to PDF, the application becomes unavailable for the users. After some time, there's a java.lang.OutOfMemoryError: Java heap space in the atlassian-confluence.log.

      The OutOfMemoryError problem might be fixed by increasing the size of the heap space.

      There some options though, like:

      1. Possibility of running the PDF export at off-hours, on a synchronized job.
      2. Attachment Size. Limiting it by size and type, finding large attachments.
      3. Pages not included in the PDF be moved to a separate space (also relevant for (1) above).

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                  1 year, 32 weeks, 5 days ago