Project: Eclipse_Platform_UI
Bug 423725 [Contributions] Popup menus slowdown over time (> 5 seconds)
Reported: 2013-12-10 11:41:41 | Status: resolved fixed

I've debugged this with Paul and it appears the issue is in org.eclipse.e4.ui.workbench.renderers.swt.ContributionRecord.merge(MExpression, MExpression) because the two expressions are identical. This causes the expression to grow larger and larger on every menu popup which makes the menu take longer to show up.

Files changed in fix:
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/ContributionRecord.java