Bug 152919 [Import/Export] import existing project w/ copy is inefficient
I just tried to import some existing projects and selected "copy projects into workspace". After a long time (sorry, no measurements) I had to cancel the request, because I was running out of disk space. I had just succeeded in importing the first project (jdt core), which takes approx. 80MB disk space, but at that time the previously blank workspace consumed additional 300MB mainly in: .metadata/.plugins/org.eclipse.core.resources/.history/ Is this operation recording undo-information for each single file imported? Unless I made something really stupid, this operation seems not to be usable for large projects.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
File projectSystemFile;
		Object projectArchiveFile;
		String projectName;
		Object parent;
		int level;
		IProjectDescription description;
		ILeveledImportStructureProvider provider;
		/**
		 * Create a record for a project based on the info in the file.
		 * 
		 * @param file
		 */
		ProjectRecord(File file) {
			projectSystemFile = file;
			setProjectName();
		}
		/**
		 * @param file
		 *            The Object representing the .project file
		 * @param parent
		 *            The parent folder of the .project file
		 * @param level
		 *            The number of levels deep in the provider the file is
		 * @param entryProvider
		 *            The provider for the archive file that contains it
		 */
		ProjectRecord(Object file, Object parent, int level,
				ILeveledImportStructureProvider entryProvider) {