Problem

Thread dumps or stack traces look like this:

	at com.atlassian.confluence.setup.bandana.ConfluenceCachingBandanaPersister.retrieve(ConfluenceCachingBandanaPersister.java(Inlined Compiled Code))
	at com.atlassian.confluence.setup.bandana.ConfluenceCachingBandanaPersister.retrieve(ConfluenceCachingBandanaPersister.java(Compiled Code))
	at com.atlassian.bandana.DefaultBandanaManager.getValue(DefaultBandanaManager.java(Compiled Code))
	at com.atlassian.bandana.DefaultBandanaManager.getValue(DefaultBandanaManager.java(Inlined Compiled Code))
	at com.atlassian.confluence.setup.settings.DefaultSettingsManager.getGlobalSettings(DefaultSettingsManager.java(Inlined Compiled Code))
	at com.atlassian.confluence.util.zip.ConfluenceGzipFilter.useGzip(ConfluenceGzipFilter.java(Compiled Code))

Diagnosis

A way to check whether this is indeed a performance problem is to load and save the Administration >> General Configuration page.

Cause

Global Configuration settings and plugin data are pulled from the bandana table. This can be inefficient, depending on how much plugin data is stored. More complex plugins that use bandana storage may be inefficient once they begin to scale.

Resolution

1. Upgrade Confluence. There are performance improvements such as CONF-10552 and many others, including indices added to the bandana table in the database.
2. Consider increasing the bandana cache. See Cache Performance Tuning. Make sure to check that you're on the correct version for your page. The cache to increase is Settings (Persistence).
   The trade off to a higher cache may be a higher heap space, or garbage collection tuning. See Garbage Collector Performance Issues.