diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e7e2defd..51088a4eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 - Replace `ifsnop/mysqldump-php` with `druidfi/mysqldump-php` for better performance (thanks @staabm).
+- Disable MU update routine in CLI router to speed up test execution.
 
 ## [4.1.0] 2024-02-20;
 
diff --git a/config/phpstan.neon.dist b/config/phpstan.neon.dist
index 8dc314d2c..2a3a72e3a 100644
--- a/config/phpstan.neon.dist
+++ b/config/phpstan.neon.dist
@@ -9,3 +9,5 @@ parameters:
   excludePaths:
     - ./../src/WordPress/Version.php # Using the WordPress version file.
     - ./../src/TestCase/WPTestCasePHPUnitMethodsTrait.php # Compat file has missing return types.
+  bootstrapFiles:
+    - ./phpstan/class-aliases.php
diff --git a/config/phpstan/class-aliases.php b/config/phpstan/class-aliases.php
new file mode 100644
index 000000000..4dc8ce76f
--- /dev/null
+++ b/config/phpstan/class-aliases.php
@@ -0,0 +1,5 @@
+<?php
+
+if (!class_exists(Ifsnop\Mysqldump\Mysqldump::class) && class_exists(Druidfi\Mysqldump\Mysqldump::class)) {
+    class_alias(Druidfi\Mysqldump\Mysqldump::class, Ifsnop\Mysqldump\Mysqldump::class);
+}
diff --git a/includes/cli-server/router.php b/includes/cli-server/router.php
index 9a8648a5b..43b38258b 100644
--- a/includes/cli-server/router.php
+++ b/includes/cli-server/router.php
@@ -9,6 +9,18 @@
 
 define('DB_ENGINE', getenv('DB_ENGINE') ?: 'mysql');
 
+// Add a unique request ID to the headers.
+$requestId             = md5( microtime() );
+$_SERVER['REQUEST_ID'] = $requestId;
+header( 'X-Request-ID: ' . $requestId );
+
+// Disable the MU upgrade routine.
+global $wp_filter;
+$wp_filter['do_mu_upgrade'][10][] = [
+    'accepted_args' => 0,
+    'function'      => '__return_false'
+];
+
 if ( file_exists( $root.$path ) ) {
 
 	// Enforces trailing slash, keeping links tidy in the admin
diff --git a/src/WordPress/Database/MysqlDatabase.php b/src/WordPress/Database/MysqlDatabase.php
index d43c32fa3..6298efa46 100644
--- a/src/WordPress/Database/MysqlDatabase.php
+++ b/src/WordPress/Database/MysqlDatabase.php
@@ -3,6 +3,7 @@
 namespace lucatume\WPBrowser\WordPress\Database;
 
 use Druidfi\Mysqldump\Mysqldump;
+use Ifsnop\Mysqldump\Mysqldump as LegacyMysqldump;
 use Exception;
 use lucatume\WPBrowser\Utils\Db as DbUtil;
 use lucatume\WPBrowser\Utils\Serializer;
@@ -324,14 +325,42 @@ public function import(string $dumpFilePath): int
         return $modifiedByQuery;
     }
 
+    private function buildIfsnopMysqlDump(): LegacyMysqldump
+    {
+        return new class( $this->dsn, $this->dbUser, $this->dbPassword ) extends LegacyMysqldump {
+            public function start($filename = ''): void
+            {
+                // @phpstan-ignore-next-line property defined in ifsnop/mysqldump dependency.
+                $this->dumpSettings['add-drop-table']    = true;
+                $this->dumpSettings['add-drop-database'] = true;
+
+                parent::start($filename);
+            }
+        };
+    }
+
+    /**
+     * @throws Exception
+     */
+    private function buildDruidfiMysqldump(): Mysqldump
+    {
+        $dumpSettings = [ 'add-drop-table' => true, 'add-drop-database' => true ];
+
+        return new Mysqldump($this->dsn, $this->dbUser, $this->dbPassword, $dumpSettings);
+    }
+
     /**
      * @throws DbException
      */
     public function dump(string $dumpFile): void
     {
         try {
-            $dumpSettings = ['add-drop-table'=> true, 'add-drop-database' => true];
-            $dump = new Mysqldump($this->dsn, $this->dbUser, $this->dbPassword, $dumpSettings);
+            if (class_exists(LegacyMysqldump::class)) {
+                $dump = $this->buildIfsnopMysqlDump();
+            } else {
+                $dump = $this->buildDruidfiMysqldump();
+            }
+            /** @var Mysqldump $dump */
             $dump->start($dumpFile);
         } catch (\Exception $e) {
             throw new  DbException("Failed to dump database: " . $e->getMessage(), DbException::FAILED_DUMP);
diff --git a/tests/webdriver.suite.dist.yml b/tests/webdriver.suite.dist.yml
index c7107fb76..951bcda22 100644
--- a/tests/webdriver.suite.dist.yml
+++ b/tests/webdriver.suite.dist.yml
@@ -17,7 +17,7 @@ modules:
       path: '/'
       window_size: false
       wait: 5
-      pageload_timeout: 5
+      pageload_timeout: 30
       capabilities:
         "goog:chromeOptions":
           args: