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
this.projectArchiveFile = file;
			this.parent = parent;
			this.level = level;
			this.provider = entryProvider;
			setProjectName();
		}
		/**
		 * Set the name of the project based on the projectFile.
		 */
		private void setProjectName() {
			IProjectDescription newDescription = null;
			try {
				if (projectArchiveFile != null) {
					InputStream stream = provider
							.getContents(projectArchiveFile);
					if (stream != null) {
						newDescription = IDEWorkbenchPlugin
								.getPluginWorkspace().loadProjectDescription(
										stream);
						stream.close();
					}
				} else {
					IPath path = new Path(projectSystemFile.getPath());
					
					
					if (isDefaultLocation(path)) {
						projectName = path.segment(path.segmentCount() - 2);
						newDescription = IDEWorkbenchPlugin
								.getPluginWorkspace().newProjectDescription(
										projectName);