diff --git a/geniusrise_vision/base/api.py b/geniusrise_vision/base/api.py
index 1b164b6..c3ebcb7 100644
--- a/geniusrise_vision/base/api.py
+++ b/geniusrise_vision/base/api.py
@@ -28,16 +28,6 @@
 sequential_lock = threading.Lock()
 
 
-def sequential_tool():
-    with sequential_lock:
-        # Yield to signal that the request can proceed
-        yield
-
-
-# Register the custom tool
-cherrypy.tools.sequential = cherrypy.Tool("before_handler", sequential_tool)
-
-
 class VisionAPI(VisionBulk):
     """
     The VisionAPI class inherits from VisionBulk and is designed to facilitate
@@ -93,6 +83,7 @@ def listen(
         compile: bool = False,
         flash_attention: bool = False,
         better_transformers: bool = False,
+        concurrent_queries: bool = False,
         endpoint: str = "*",
         port: int = 3000,
         cors_domain: str = "http://localhost:3000",
@@ -115,6 +106,7 @@ def listen(
             compile (bool, optional): Whether to compile the model before fine-tuning. Defaults to False.
             flash_attention (bool): Whether to use flash attention 2. Default is False.
             better_transformers (bool): Flag to enable Better Transformers optimization for faster processing.
+            concurrent_queries: (bool): Whether the API supports concurrent API calls (usually false).
             endpoint (str, optional): The network endpoint for the server. Defaults to "*".
             port (int, optional): The network port for the server. Defaults to 3000.
             cors_domain (str, optional): The domain to allow for CORS requests. Defaults to "http://localhost:3000".
@@ -134,6 +126,7 @@ def listen(
         self.compile = compile
         self.flash_attention = flash_attention
         self.better_transformers = better_transformers
+        self.concurrent_queries = concurrent_queries
         self.model_args = model_args
         self.username = username
         self.password = password
@@ -175,6 +168,14 @@ def listen(
                 # **self.model_args,
             )
 
+        def sequential_locker():
+            if self.concurrent_queries:
+                sequential_lock.acquire()
+
+        def sequential_unlocker():
+            if self.concurrent_queries:
+                sequential_lock.release()
+
         def CORS():
             """
             Configures Cross-Origin Resource Sharing (CORS) for the server.
@@ -219,6 +220,8 @@ def CORS():
             # Configure basic authentication
             conf = {
                 "/": {
+                    "tools.sequential_locker.on": True,
+                    "tools.sequential_unlocker.on": True,
                     "tools.auth_basic.on": True,
                     "tools.auth_basic.realm": "geniusrise",
                     "tools.auth_basic.checkpassword": self.validate_password,
@@ -227,11 +230,19 @@ def CORS():
             }
         else:
             # Configuration without authentication
-            conf = {"/": {"tools.CORS.on": True}}
+            conf = {
+                "/": {
+                    "tools.sequential_locker.on": True,
+                    "tools.sequential_unlocker.on": True,
+                    "tools.CORS.on": True,
+                }
+            }
 
+        cherrypy.tools.sequential_locker = cherrypy.Tool("before_handler", sequential_locker)
         cherrypy.tools.CORS = cherrypy.Tool("before_handler", CORS)
         cherrypy.tree.mount(self, "/api/v1/", conf)
         cherrypy.tools.CORS = cherrypy.Tool("before_finalize", CORS)
+        cherrypy.tools.sequential_unlocker = cherrypy.Tool("before_finalize", sequential_unlocker)
         cherrypy.engine.start()
         cherrypy.engine.block()