diff --git a/scenarios/grpc.js b/scenarios/grpc.js
index 94f299f..11b8615 100644
--- a/scenarios/grpc.js
+++ b/scenarios/grpc.js
@@ -1,6 +1,7 @@
 import native from 'k6/x/neofs/native';
 import crypto from 'k6/crypto';
 import { SharedArray } from 'k6/data';
+import { sleep } from 'k6';
 
 const obj_list = new SharedArray('obj_list', function () {
     return JSON.parse(open(__ENV.PREGEN_JSON)).objects; });
@@ -75,6 +76,10 @@ export function obj_write() {
     if (!resp.success) {
         console.log(resp.error);
     }
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
+   
 }
 
 export function obj_read() {
@@ -83,6 +88,9 @@ export function obj_read() {
     if (!resp.success) {
         console.log(resp.error);
     } 
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
 }
 
 export function uuidv4() {
diff --git a/scenarios/http.js b/scenarios/http.js
index a79c8fb..bcd1ec8 100644
--- a/scenarios/http.js
+++ b/scenarios/http.js
@@ -73,7 +73,9 @@ export function obj_write() {
     if (resp.status != 200) {
         console.log(`${resp.status}`);
     }
-    //sleep(1)
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
 }
 
 export function obj_read() {
@@ -82,6 +84,9 @@ export function obj_read() {
     if (resp.status != 200) {
         console.log(`${random_read_obj.object} - ${resp.status}`);
     }
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
 }
 
 export function uuidv4() {
diff --git a/scenarios/s3.js b/scenarios/s3.js
index 1178861..f0ad09c 100644
--- a/scenarios/s3.js
+++ b/scenarios/s3.js
@@ -1,6 +1,7 @@
 import s3 from 'k6/x/neofs/s3';
 import crypto from 'k6/crypto';
 import { SharedArray } from 'k6/data';
+import { sleep } from 'k6';
 
 const obj_list = new SharedArray('obj_list', function () {
     return JSON.parse(open(__ENV.PREGEN_JSON)).objects; });
@@ -83,6 +84,10 @@ export function obj_write() {
     if (!resp.success) {
         console.log(resp.error);
     } 
+
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
     
 }
 
@@ -93,7 +98,10 @@ export function obj_read() {
     if (!resp.success) {
         console.log(resp.error);
     } 
-     
+    
+    if (__ENV.SLEEP) {
+        sleep(__ENV.SLEEP);
+    }
 
 }