diff --git a/src/Control/Director.php b/src/Control/Director.php
index 8b85e1fee..51827f628 100644
--- a/src/Control/Director.php
+++ b/src/Control/Director.php
@@ -365,12 +365,13 @@ class Director implements TemplateGlobalProvider
             };
             break;
         }
-
+$start = time();
         // Call the handler with the configured middlewares
         $response = $this->callMiddleware($request, $handler);
-
+$end = time();
         // Note that if a different request was previously registered, this will now be lost
         // In these cases it's better to use Kernel::nest() prior to kicking off a nested request
+        $elapsed = $end - $start;
         Injector::inst()->unregisterNamedObject(HTTPRequest::class);
 
         return $response;
diff --git a/src/Control/Middleware/HTTPMiddlewareAware.php b/src/Control/Middleware/HTTPMiddlewareAware.php
index e7e861898..36ff486c1 100644
--- a/src/Control/Middleware/HTTPMiddlewareAware.php
+++ b/src/Control/Middleware/HTTPMiddlewareAware.php
@@ -54,12 +54,21 @@ trait HTTPMiddlewareAware
      */
     protected function callMiddleware(HTTPRequest $request, callable $last)
     {
+        $classes = array_map(function ($middle) {
+            return get_class($middle);
+        }, $this->getMiddlewares());
+
+
         // Reverse middlewares
         $next = $last;
         /** @var HTTPMiddleware $middleware */
         foreach (array_reverse($this->getMiddlewares()) as $middleware) {
             $next = function ($request) use ($middleware, $next) {
-                return $middleware->process($request, $next);
+                $start = time();
+                $value = $middleware->process($request, $next);
+                $end = time();
+                $elapsed = $end - $start;
+                return $value;
             };
         }
         return $next($request);
diff --git a/src/Core/Extensible.php b/src/Core/Extensible.php
index 805aab2dd..b8e2c7fe7 100644
--- a/src/Core/Extensible.php
+++ b/src/Core/Extensible.php
@@ -388,8 +388,9 @@ trait Extensible
             if (!$strict && is_subclass_of($extension, $requiredExtension)) {
                 return true;
             }
-            if (Injector::inst()->get($extension) instanceof $requiredExtension) {
-                return true;
+            $inst = Injector::inst()->get($extension);
+            if ($inst instanceof $requiredExtension) {
+                return $strict ? get_class($inst) === $requiredExtension : true;
             }
         }
 
diff --git a/tests/php/Core/ObjectTest.php b/tests/php/Core/ObjectTest.php
index 886a5cd0a..b3971e987 100644
--- a/tests/php/Core/ObjectTest.php
+++ b/tests/php/Core/ObjectTest.php
@@ -11,6 +11,7 @@ use SilverStripe\Core\Tests\ObjectTest\ExtendTest1;
 use SilverStripe\Core\Tests\ObjectTest\ExtendTest2;
 use SilverStripe\Core\Tests\ObjectTest\ExtendTest3;
 use SilverStripe\Core\Tests\ObjectTest\ExtendTest4;
+use SilverStripe\Core\Tests\ObjectTest\ExtendTest5;
 use SilverStripe\Core\Tests\ObjectTest\ExtensionRemoveTest;
 use SilverStripe\Core\Tests\ObjectTest\ExtensionTest;
 use SilverStripe\Core\Tests\ObjectTest\ExtensionTest2;
@@ -289,6 +290,13 @@ class ObjectTest extends SapphireTest
             $objectTest_ExtensionTest->hasExtension(ExtendTest3::class),
             "Extensions are detected with instance hasExtension() when added through add_extension()"
         );
+        
+        // load in a custom implementation
+        Injector::inst()->registerService(new ExtendTest5(), ExtendTest4::class);
+        $this->assertTrue(
+            ExtensionTest3::has_extension(ExtendTest5::class),
+            "Injected sub-extensions are detected with static has_extension() when added through add_extension()"
+        );
 
         // @todo At the moment, this does NOT remove the extension due to parameterized naming,
         //  meaning the extension will remain added in further test cases
diff --git a/tests/php/Core/ObjectTest/ExtendTest5.php b/tests/php/Core/ObjectTest/ExtendTest5.php
new file mode 100644
index 000000000..814c192b7
--- /dev/null
+++ b/tests/php/Core/ObjectTest/ExtendTest5.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace SilverStripe\Core\Tests\ObjectTest;
+
+class ExtendTest5 extends ExtendTest4
+{
+    public function extendableMethod($argument = null)
+    {
+        return "ExtendTest5($argument)";
+    }
+}