diff --git a/tests/org.eclipse.ui.tests.performance/src/org/eclipse/ui/tests/performance/KeyBindingServicePerformanceTest.java b/tests/org.eclipse.ui.tests.performance/src/org/eclipse/ui/tests/performance/KeyBindingServicePerformanceTest.java
new file mode 100644
index 00000000000..20baa309b38
--- /dev/null
+++ b/tests/org.eclipse.ui.tests.performance/src/org/eclipse/ui/tests/performance/KeyBindingServicePerformanceTest.java
@@ -0,0 +1,159 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Vogella GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Lars Vogel <Lars.Vogel@vogella.com> - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.tests.performance;
+
+import static org.eclipse.ui.tests.harness.util.UITestUtil.openTestWindow;
+import static org.eclipse.ui.tests.performance.UIPerformanceTestUtil.exercise;
+import static org.eclipse.ui.tests.performance.UIPerformanceTestUtil.reportTimings;
+import static org.junit.Assert.assertNotNull;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+
+import org.eclipse.core.commands.Category;
+import org.eclipse.core.commands.Command;
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.ui.IKeyBindingService;
+import org.eclipse.ui.IPageLayout;
+import org.eclipse.ui.IViewPart;
+import org.eclipse.ui.IWorkbenchWindow;
+import org.eclipse.ui.commands.ICommandService;
+import org.eclipse.ui.tests.harness.util.CloseTestWindowsRule;
+import org.junit.Before;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+/**
+ * Measures how long it takes a part to register its actions with the key
+ * binding service, which is what every editor does while it is being created.
+ * <p>
+ * The action count is a parameter so that the growth of the registration cost
+ * with the number of actions is visible, rather than only its value at one
+ * arbitrary size.
+ */
+@SuppressWarnings("deprecation") // IKeyBindingService is the API under measurement
+@RunWith(Parameterized.class)
+public class KeyBindingServicePerformanceTest {
+
+	private static final String CATEGORY_ID = "org.eclipse.ui.tests.performance.keyBindingCategory";
+
+	private static final String COMMAND_ID_PREFIX = "org.eclipse.ui.tests.performance.keyBindingCommand";
+
+	/** AbstractTextEditor registers on the order of the larger counts here. */
+	private static final int MAX_ACTION_COUNT = 200;
+
+	private static final int WARMUP_ROUNDS = 5;
+
+	private static final int MIN_ROUNDS = 20;
+
+	private static final int MAX_ROUNDS = 200;
+
+	private static final int MAX_MEASURE_TIME_MS = 5000;
+
+	@ClassRule
+	public static final UIPerformanceTestRule uiPerformanceTestRule = new UIPerformanceTestRule();
+
+	@Rule
+	public final CloseTestWindowsRule closeTestWindows = new CloseTestWindowsRule();
+
+	private final int actionCount;
+
+	private IKeyBindingService keyBindingService;
+
+	private List<IAction> actions;
+
+	@Parameters(name = "{index}: {0} actions")
+	public static Collection<Object[]> data() {
+		return Arrays.asList(new Object[][] { { 25 }, { 50 }, { 100 }, { MAX_ACTION_COUNT } });
+	}
+
+	public KeyBindingServicePerformanceTest(int actionCount) {
+		this.actionCount = actionCount;
+	}
+
+	@Before
+	public void setUp() throws Exception {
+		IWorkbenchWindow window = openTestWindow(UIPerformanceTestRule.PERSPECTIVE1);
+		ICommandService commandService = window.getWorkbench().getService(ICommandService.class);
+		Category category = commandService.getCategory(CATEGORY_ID);
+		if (!category.isDefined()) {
+			category.define("Key Binding Service Performance", null);
+		}
+		for (int i = 0; i < actionCount; i++) {
+			Command command = commandService.getCommand(COMMAND_ID_PREFIX + i);
+			if (!command.isDefined()) {
+				command.define("Key Binding Performance Command " + i, null, category);
+			}
+		}
+
+		IViewPart view = window.getActivePage().showView(IPageLayout.ID_OUTLINE);
+		keyBindingService = view.getSite().getKeyBindingService();
+		assertNotNull("No key binding service for the test part", keyBindingService);
+
+		actions = new ArrayList<>(actionCount);
+		for (int i = 0; i < actionCount; i++) {
+			actions.add(new CommandAction(COMMAND_ID_PREFIX + i));
+		}
+	}
+
+	@Test
+	public void test() throws Exception {
+		for (int i = 0; i < WARMUP_ROUNDS; i++) {
+			registerAll();
+			unregisterAll();
+		}
+
+		List<Long> registerTimes = new ArrayList<>();
+		List<Long> unregisterTimes = new ArrayList<>();
+
+		exercise(() -> {
+			registerTimes.add(registerAll());
+			unregisterTimes.add(unregisterAll());
+		}, MIN_ROUNDS, MAX_ROUNDS, MAX_MEASURE_TIME_MS);
+
+		reportTimings("KeyBindingService register " + actionCount + " actions", registerTimes);
+		reportTimings("KeyBindingService unregister " + actionCount + " actions", unregisterTimes);
+	}
+
+	private long registerAll() {
+		long before = System.nanoTime();
+		for (IAction action : actions) {
+			keyBindingService.registerAction(action);
+		}
+		return System.nanoTime() - before;
+	}
+
+	private long unregisterAll() {
+		long before = System.nanoTime();
+		for (IAction action : actions) {
+			keyBindingService.unregisterAction(action);
+		}
+		return System.nanoTime() - before;
+	}
+
+	/** Distinct command id per action, as a part's actions have. */
+	private static final class CommandAction extends Action {
+		CommandAction(String commandId) {
+			setId(commandId);
+			setActionDefinitionId(commandId);
+		}
+	}
+}