diff --git a/src/server/cli/test-runner.js b/src/server/cli/test-runner.js
index 4fc938e3..91baee43 100755
--- a/src/server/cli/test-runner.js
+++ b/src/server/cli/test-runner.js
@@ -70,7 +70,7 @@ async function getTestRunnerOptions(argv = []) {
 			name: 'golden',
 			type: Boolean,
 			description: 'Generate new golden screenshots. Ignored unless group is "vdiff".',
-			order: 12
+			order: 13
 		},
 		{
 			name: 'grep',
@@ -83,7 +83,7 @@ async function getTestRunnerOptions(argv = []) {
 			name: 'help',
 			type: Boolean,
 			description: 'Print usage information and exit',
-			order: 13
+			order: 14
 		},
 		{
 			name: 'open',
@@ -96,6 +96,12 @@ async function getTestRunnerOptions(argv = []) {
 			longAlias: 'webkit',
 			type: Boolean
 		},
+		{
+			name: 'slowmo',
+			type: Number,
+			description: 'Slows down test operations by the specified number of milliseconds. Useful so that you can see what is going on.',
+			order: 12
+		},
 		{
 			name: 'timeout',
 			alias: 't',
diff --git a/src/server/wtr-config.js b/src/server/wtr-config.js
index 9998499a..1ae9bc17 100644
--- a/src/server/wtr-config.js
+++ b/src/server/wtr-config.js
@@ -211,7 +211,8 @@ export class WTRConfig {
 			createBrowserContext: ({ browser }) => browser.newContext({ deviceScaleFactor: 2, reducedMotion: 'reduce' }),
 			launchOptions: {
 				headless: !this.#cliArgs.open,
-				devtools: false
+				devtools: false,
+				slowMo: this.#cliArgs.slowmo || 0
 			}
 		}));
 	}