diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index ebc73673..9589c8c0 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -72,7 +72,7 @@ jobs:
           envs: >-
             DB_PASSWORD,GCS_BUCKET,GCS_BACKUP_BUCKET,
             KAKAO_CLIENT_ID,KAKAO_CLIENT_SECRET,KAKAO_REDIRECT_URI_PROD,KAKAO_REDIRECT_URI_STAGING,KAKAO_ADMIN_KEY,
-            JWT_SECRET_KEY,FIREBASE_SERVICE_ACCOUNT_KEY
+            JWT_SECRET_KEY,FIREBASE_SERVICE_ACCOUNT_KEY,FCM_FAKE_LATENCY_MS
           script: |
             chmod +x /home/ubuntu/cockple/scripts/deploy.sh
             bash /home/ubuntu/cockple/scripts/deploy.sh \
@@ -89,3 +89,5 @@ jobs:
           KAKAO_ADMIN_KEY: ${{ secrets.KAKAO_ADMIN_KEY }}
           JWT_SECRET_KEY: ${{ secrets.JWT_SECRET_KEY }}
           FIREBASE_SERVICE_ACCOUNT_KEY: ${{ secrets.FIREBASE_SERVICE_ACCOUNT_KEY }}
+          # [부하테스트용] FCM 지연(ms) 토글. GitHub Variable로 관리(미설정 시 빈값→deploy.sh에서 0). PR 없이 값 변경+deploy 재실행으로 on/off.
+          FCM_FAKE_LATENCY_MS: ${{ vars.FCM_FAKE_LATENCY_MS }}
diff --git a/docker-compose.yml b/docker-compose.yml
index 2a883bb6..18bb6ed4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -79,6 +79,8 @@ services:
     environment:
       JAVA_TOOL_OPTIONS: "-Xms128m -Xmx512m"
       SPRING_PROFILES_ACTIVE: staging
+      # [부하테스트용] FCM 인위적 지연(ms). 미설정 시 0=비활성. staging 전용.
+      FCM_FAKE_LATENCY_MS: ${FCM_FAKE_LATENCY_MS:-0}
       DB_PASSWORD: ${DB_PASSWORD}
       GCS_BUCKET: ${GCS_BUCKET}
       KAKAO_CLIENT_ID: ${KAKAO_CLIENT_ID}
diff --git a/scripts/deploy.sh b/scripts/deploy.sh
index 6e9a5fa7..8502513b 100644
--- a/scripts/deploy.sh
+++ b/scripts/deploy.sh
@@ -26,6 +26,7 @@ KAKAO_REDIRECT_URI_STAGING=${KAKAO_REDIRECT_URI_STAGING}
 KAKAO_ADMIN_KEY=${KAKAO_ADMIN_KEY}
 JWT_SECRET_KEY=${JWT_SECRET_KEY}
 FIREBASE_SERVICE_ACCOUNT_KEY=${FIREBASE_SERVICE_ACCOUNT_KEY}
+FCM_FAKE_LATENCY_MS=${FCM_FAKE_LATENCY_MS:-0}
 EOF
 
 echo "${FIREBASE_SERVICE_ACCOUNT_KEY}" > /home/ubuntu/cockple/firebase-service-account.json
diff --git a/src/main/java/umc/cockple/demo/domain/notification/fcm/FcmService.java b/src/main/java/umc/cockple/demo/domain/notification/fcm/FcmService.java
index ff1f9e71..30e0ab31 100644
--- a/src/main/java/umc/cockple/demo/domain/notification/fcm/FcmService.java
+++ b/src/main/java/umc/cockple/demo/domain/notification/fcm/FcmService.java
@@ -8,6 +8,7 @@
 import com.google.firebase.messaging.WebpushFcmOptions;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import umc.cockple.demo.domain.chat.enums.ChatRoomType;
@@ -24,6 +25,9 @@ public class FcmService {
     private final MemberRepository memberRepository;
     private final FirebaseMessaging firebaseMessaging;
 
+    @Value("${fcm.fake-latency-ms:0}")
+    private long fakeLatencyMs;
+
     @Transactional
     public void registerFcmToken(Long memberId, String fcmToken) {
         Member member = memberRepository.findById(memberId)
@@ -33,6 +37,10 @@ public void registerFcmToken(Long memberId, String fcmToken) {
     }
 
     public void sendNotification(Member member, String title, String content) {
+        if (applyFakeLatencyAndSkip(member.getId())) {
+            return;
+        }
+
         String fcmToken = member.getFcmToken();
         if (fcmToken == null || fcmToken.isBlank()) {
             log.info("FCM 토큰 없음 - memberId: {}, 알림 전송 생략", member.getId());
@@ -58,6 +66,10 @@ public void sendNotification(Member member, String title, String content) {
 
     public void sendChatNotification(Member member, String title, String content,
                                      Long chatRoomId, ChatRoomType chatRoomType) {
+        if (applyFakeLatencyAndSkip(member.getId())) {
+            return;
+        }
+
         String fcmToken = member.getFcmToken();
         if (fcmToken == null || fcmToken.isBlank()) {
             log.info("FCM 토큰 없음 - memberId: {}, 채팅 알림 전송 생략", member.getId());
@@ -86,6 +98,22 @@ public void sendChatNotification(Member member, String title, String content,
         }
     }
 
+    /**
+     * 부하테스트용 FCM 지연 주입.
+     */
+    private boolean applyFakeLatencyAndSkip(Long memberId) {
+        if (fakeLatencyMs <= 0) {
+            return false;
+        }
+        try {
+            Thread.sleep(fakeLatencyMs);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+        log.info("[FCM][FAKE] 지연주입 {}ms 후 실전송 스킵 - memberId: {}", fakeLatencyMs, memberId);
+        return true;
+    }
+
     /**
      * 채팅 알림 클릭 시 이동할 경로(상대경로)를 생성한다.
      * webpush.fcm_options.link 로 전달되어 FCM이 클릭 시 네이티브로 이동시킨다.
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 258ef906..903b6e69 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -85,6 +85,9 @@ jwt:
   access-token-validity: 900000
   refresh-token-validity: 1209600000
 
+fcm:
+  fake-latency-ms: 0
+
 logging:
   level:
     org.hibernate.SQL: WARN