Issue #3207208: Optimisation not working for Images

src/EventSubscriber/OptimizerSubscriber.php

@@ -72,7 +72,7 @@ class OptimizerSubscriber implements EventSubscriberInterface {
   public static function getSubscribedEvents() {
     return [
       KernelEvents::RESPONSE => [
-        ['optimizer'],
+        ['optimizer', -9999],
       ],
     ];
   }