diff --git a/docs/references/testing.md b/docs/references/testing.md
index 30766858a..67a993c41 100644
--- a/docs/references/testing.md
+++ b/docs/references/testing.md
@@ -33,3 +33,16 @@ class ActionsTest extends TestCase
     }
 }
 ```
+
+## Improving the Speed of Running Tests
+
+By default, Shield has set the `Config\Auth::$hashCost = 12` due to the greater security of passwords. However, to increase the test execution time, we have set the `$hashCost = 4` for the test environment.
+
+If you use Shield in your project and your tests execution time is high, just set the `$hashCost = 4` in file **phpunit.xml.dist** of your project as follows:
+
+```
+<php>
+	<!-- Set hashCost for improving the speed of running tests -->
+	<env name="auth.hashCost" value="4"/>
+</php>
+```
\ No newline at end of file
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index af444e0a1..b25b4ca2a 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -79,6 +79,8 @@
 
 	<php>
 		<env name="XDEBUG_MODE" value="coverage"/>
+		<!-- Set hashCost for improving the speed of running tests -->
+		<env name="auth.hashCost" value="4"/>
 		<server name="app.baseURL" value="https://example.com/"/>
 
 		<!-- Directory containing phpunit.xml -->