He-Pin commented on code in PR #2117:
URL: https://github.com/apache/pekko/pull/2117#discussion_r2312271537


##########
stream/src/main/scala/org/apache/pekko/stream/SystemMaterializer.scala:
##########
@@ -96,7 +96,11 @@ final class SystemMaterializer(system: ExtendedActorSystem) 
extends Extension {
 
   val materializer: Materializer = {
     // block on async creation to make it effectively final
-    Await.result(systemMaterializerPromise.future, 
materializerTimeout.duration)
+    val future = systemMaterializerPromise.future
+    future.value match {
+      case Some(value) => value.get
+      case _           => Await.result(future, materializerTimeout.duration)
+    }

Review Comment:
   I think this can improve a little performance



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