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In the Confluence Administration → Logging and Profiling section add a new Entry with Package de.griffel.confluence.plugins.plantuml and Log Level INFO.
After that you should see the rendering performance for each plantuml macro in the confluence.home/logs/atlassian-confluence.log File:
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2016-04-08 13:52:53,161 INFO [...] [confluence.plugins.plantuml.PlantUmlMacro] executeInternal Rendering UML diagram on page Foo:Bar took 375 ms. |
"Error: dot cannot generated PNG file. Check your dot installation.
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Error 'class de.griffel.confluence.plugins.plantuml.config.PlantUmlConfigurationBean cannot be cast to class de.griffel.confluence.plugins.plantuml.config.PlantUmlConfiguration'
This error is caused if two different versions of the plugin are installed in Confluence.
Please try to uninstall the plugin and then reinstall the plugin. If this does not help then perform the steps described here: https://confluence.atlassian.com/confkb/how-to-clear-confluence-plugins-cache-297664846.html