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The performance of opening the java editor popup menu mainly suffers from displaying of the "Goto Source" and "Goto Declaration" items. For them to be displayed they current caret context needs to be evaluated by the code completion which can be slow especially in cases when the code completion was not initialized yet.
Let's track this under issue 27771 - UI responsiveness is more general category than performance. *** This issue has been marked as a duplicate of 27771 ***