diff --git a/main.py b/main.py
index 4780a9c69..2126763cf 100644
--- a/main.py
+++ b/main.py
@@ -69,6 +69,13 @@ def execute_prestartup_script():
     if args.disable_all_custom_nodes:
         return
 
+    # Get the environment variable and convert it to a list (if not empty)
+    included_custom_nodes = os.environ.get("INCLUDED_CUSTOM_NODES", "").strip()
+    included_custom_nodes = (
+        [name.strip() for name in included_custom_nodes.split(",")]
+        if included_custom_nodes else None
+    )
+
     node_paths = folder_paths.get_folder_paths("custom_nodes")
     for custom_node_path in node_paths:
         possible_modules = os.listdir(custom_node_path)
@@ -79,6 +86,10 @@ def execute_prestartup_script():
             if os.path.isfile(module_path) or module_path.endswith(".disabled") or module_path == "__pycache__":
                 continue
 
+            # Skip modules that are not in INCLUDED_CUSTOM_NODES
+            if included_custom_nodes and possible_module not in included_custom_nodes:
+                continue
+
             script_path = os.path.join(module_path, "prestartup_script.py")
             if os.path.exists(script_path):
                 time_before = time.perf_counter()
diff --git a/nodes.py b/nodes.py
index 8c1720c1a..92e05b9ca 100644
--- a/nodes.py
+++ b/nodes.py
@@ -2184,6 +2184,13 @@ def init_external_custom_nodes():
     Returns:
         None
     """
+    # Get the environment variable and convert it to a list (if not empty)
+    included_custom_nodes = os.environ.get("INCLUDED_CUSTOM_NODES", "").strip()
+    included_custom_nodes = (
+        [name.strip() for name in included_custom_nodes.split(",")]
+        if included_custom_nodes else None
+    )
+
     base_node_names = set(NODE_CLASS_MAPPINGS.keys())
     node_paths = folder_paths.get_folder_paths("custom_nodes")
     node_import_times = []
@@ -2193,6 +2200,10 @@ def init_external_custom_nodes():
             possible_modules.remove("__pycache__")
 
         for possible_module in possible_modules:
+            # Skip modules that are not in INCLUDED_CUSTOM_NODES
+            if included_custom_nodes and possible_module not in included_custom_nodes:
+                continue
+
             module_path = os.path.join(custom_node_path, possible_module)
             if os.path.isfile(module_path) and os.path.splitext(module_path)[1] != ".py": continue
             if module_path.endswith(".disabled"): continue