diff --git a/homeassistant/helpers/device_registry.py b/homeassistant/helpers/device_registry.py
index e31c372c18e..9666ad302ad 100644
--- a/homeassistant/helpers/device_registry.py
+++ b/homeassistant/helpers/device_registry.py
@@ -9,7 +9,6 @@ from functools import lru_cache, partial
 import logging
 import time
 from typing import TYPE_CHECKING, Any, Literal, TypedDict, TypeVar, cast
-from urllib.parse import urlparse
 
 import attr
 from yarl import URL
@@ -212,22 +211,22 @@ def _validate_device_info(
     return device_info_type
 
 
+_cached_parse_url = lru_cache(maxsize=512)(URL)
+"""Parse a URL and cache the result."""
+
+
 def _validate_configuration_url(value: Any) -> str | None:
     """Validate and convert configuration_url."""
     if value is None:
         return None
-    if (
-        isinstance(value, URL)
-        and (value.scheme not in CONFIGURATION_URL_SCHEMES or not value.host)
-    ) or (
-        (parsed_url := urlparse(str(value)))
-        and (
-            parsed_url.scheme not in CONFIGURATION_URL_SCHEMES
-            or not parsed_url.hostname
-        )
-    ):
+
+    url_as_str = str(value)
+    url = value if type(value) is URL else _cached_parse_url(url_as_str)
+
+    if url.scheme not in CONFIGURATION_URL_SCHEMES or not url.host:
         raise ValueError(f"invalid configuration_url '{value}'")
-    return str(value)
+
+    return url_as_str
 
 
 @attr.s(frozen=True)
diff --git a/tests/components/onvif/__init__.py b/tests/components/onvif/__init__.py
index 5164939eead..fea27f501e8 100644
--- a/tests/components/onvif/__init__.py
+++ b/tests/components/onvif/__init__.py
@@ -125,6 +125,7 @@ def setup_mock_onvif_camera(
 def setup_mock_device(mock_device, capabilities=None):
     """Prepare mock ONVIFDevice."""
     mock_device.async_setup = AsyncMock(return_value=True)
+    mock_device.port = 80
     mock_device.available = True
     mock_device.name = NAME
     mock_device.info = DeviceInfo(