diff --git a/apps/infra/production/codedang/codedang_service_client.tf b/apps/infra/production/codedang/codedang_service_client.tf
index ad7e03d6d3..f8f6c0b5b2 100644
--- a/apps/infra/production/codedang/codedang_service_client.tf
+++ b/apps/infra/production/codedang/codedang_service_client.tf
@@ -107,7 +107,7 @@ module "client_api" {
   ecs_service = {
     name          = "Codedang-Client-Api-Service"
     cluster_arn   = module.codedang_api.ecs_cluster.arn
-    desired_count = 2
+    desired_count = 3
     load_balancer = {
       container_name   = "Codedang-Client-Api"
       container_port   = 4000
@@ -116,7 +116,7 @@ module "client_api" {
   }
 
   appautoscaling_target = {
-    min_capacity = 2
+    min_capacity = 3
     max_capacity = 8
     resource_id = {
       cluster_name = module.codedang_api.ecs_cluster.name
diff --git a/apps/infra/production/codedang/codedang_service_iris.tf b/apps/infra/production/codedang/codedang_service_iris.tf
index d3fdc5cbb2..1b68129a1b 100644
--- a/apps/infra/production/codedang/codedang_service_iris.tf
+++ b/apps/infra/production/codedang/codedang_service_iris.tf
@@ -31,7 +31,7 @@ module "iris" {
   task_definition = {
     family = "Codedang-Iris-Api"
     cpu    = 512
-    memory = 1700
+    memory = 512
 
     container_definitions = jsonencode([
       jsondecode(templatefile("container_definitions/iris.json", {
@@ -75,12 +75,12 @@ module "iris" {
   ecs_service = {
     name          = "Codedang-Iris-Service"
     cluster_arn   = module.codedang_iris.ecs_cluster.arn
-    desired_count = 2
+    desired_count = 6
   }
 
   appautoscaling_target = {
-    min_capacity = 2
-    max_capacity = 8
+    min_capacity = 6
+    max_capacity = 6
     resource_id = {
       cluster_name = module.codedang_iris.ecs_cluster.name
     }
diff --git a/apps/iris/src/common/constants/constants.go b/apps/iris/src/common/constants/constants.go
index 0aae1ce8cc..dccb337ead 100644
--- a/apps/iris/src/common/constants/constants.go
+++ b/apps/iris/src/common/constants/constants.go
@@ -53,3 +53,5 @@ const (
 	EXCHANGE   = "judger-exchange"
 	RESULT_KEY = "result"
 )
+
+const MAX_OUTPUT = 1048576 // 1MB
diff --git a/apps/iris/src/handler/judge-handler.go b/apps/iris/src/handler/judge-handler.go
index 83c5305676..14241b1435 100644
--- a/apps/iris/src/handler/judge-handler.go
+++ b/apps/iris/src/handler/judge-handler.go
@@ -284,13 +284,9 @@ func (j *JudgeHandler) Handle(id string, data []byte, hidden bool, out chan Judg
 	}
 
 	tcNum := tc.Count()
-	cnt := make(chan int)
 	for i := 0; i < tcNum; i++ {
-		go j.judgeTestcase(i, dir, validReq, tc.Elements[i], out, cnt)
-	}
-
-	for i := 0; i < tcNum; i++ {
-		<-cnt
+		j.judgeTestcase(i, dir, validReq, tc.Elements[i], out)
+		// j.logger.Log(logger.DEBUG, fmt.Sprintf("Testcase %d judged", i))
 	}
 }
 
@@ -324,7 +320,7 @@ func (j *JudgeHandler) getTestcase(traceCtx context.Context, out chan<- result.C
 }
 
 func (j *JudgeHandler) judgeTestcase(idx int, dir string, validReq *Request,
-	tc loader.Element, out chan JudgeResultMessage, cnt chan int) {
+	tc loader.Element, out chan JudgeResultMessage) {
 
 	var accepted bool
 
@@ -351,6 +347,10 @@ func (j *JudgeHandler) judgeTestcase(idx int, dir string, validReq *Request,
 	res.SetJudgeExecResult(runResult.ExecResult)
 	res.Output = string(runResult.Output)
 
+	if len(res.Output) > constants.MAX_OUTPUT {
+		res.Output = res.Output[:constants.MAX_OUTPUT]
+	}
+
 	if runResult.ExecResult.ResultCode != sandbox.RUN_SUCCESS {
 		res.SetJudgeResultCode(SandboxResultCodeToJudgeResultCode(runResult.ExecResult.ResultCode))
 		goto Send
@@ -376,5 +376,4 @@ Send:
 		// j.logger.Log(logger.DEBUG, string(marshaledRes))
 		out <- JudgeResultMessage{marshaledRes, ParseError(res)}
 	}
-	cnt <- 1
 }