diff --git a/devine/core/downloaders/requests.py b/devine/core/downloaders/requests.py
index 54ec0f7..c6d23fc 100644
--- a/devine/core/downloaders/requests.py
+++ b/devine/core/downloaders/requests.py
@@ -1,4 +1,5 @@
 import math
+import os
 import time
 from concurrent import futures
 from concurrent.futures.thread import ThreadPoolExecutor
@@ -196,6 +197,9 @@ def requests(
     if not isinstance(urls, list):
         urls = [urls]
 
+    if not max_workers:
+        max_workers = min(32, (os.cpu_count() or 1) + 4)
+
     urls = [
         dict(
             save_path=save_path,
@@ -214,7 +218,8 @@ def requests(
     session = Session()
     session.mount("https://", HTTPAdapter(
         pool_connections=max_workers,
-        pool_maxsize=max_workers
+        pool_maxsize=max_workers,
+        pool_block=True
     ))
     session.mount("http://", session.adapters["https://"])