diff --git a/homeassistant/auth/permissions/entities.py b/homeassistant/auth/permissions/entities.py
index 3f2a0c14f19..4dc221a9ff4 100644
--- a/homeassistant/auth/permissions/entities.py
+++ b/homeassistant/auth/permissions/entities.py
@@ -47,7 +47,7 @@ def _lookup_domain(
     perm_lookup: PermissionLookup, domains_dict: SubCategoryDict, entity_id: str
 ) -> ValueType | None:
     """Look up entity permissions by domain."""
-    return domains_dict.get(entity_id.split(".", 1)[0])
+    return domains_dict.get(entity_id.partition(".")[0])
 
 
 def _lookup_area(
diff --git a/homeassistant/auth/providers/command_line.py b/homeassistant/auth/providers/command_line.py
index af9a01f5d9b..92d8d617481 100644
--- a/homeassistant/auth/providers/command_line.py
+++ b/homeassistant/auth/providers/command_line.py
@@ -88,12 +88,12 @@ class CommandLineAuthProvider(AuthProvider):
             for _line in stdout.splitlines():
                 try:
                     line = _line.decode().lstrip()
-                    if line.startswith("#"):
-                        continue
-                    key, value = line.split("=", 1)
                 except ValueError:
                     # malformed line
                     continue
+                if line.startswith("#") or "=" not in line:
+                    continue
+                key, _, value = line.partition("=")
                 key = key.strip()
                 value = value.strip()
                 if key in self.ALLOWED_META_KEYS:
diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index 31834c7b7a3..9ac8b2ef6e6 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -404,7 +404,7 @@ async def async_mount_local_lib_path(config_dir: str) -> str:
 def _get_domains(hass: core.HomeAssistant, config: dict[str, Any]) -> set[str]:
     """Get domains of components to set up."""
     # Filter out the repeating and common config section [homeassistant]
-    domains = {key.split(" ")[0] for key in config if key != core.DOMAIN}
+    domains = {key.partition(" ")[0] for key in config if key != core.DOMAIN}
 
     # Add config entry domains
     if not hass.config.safe_mode:
diff --git a/homeassistant/config.py b/homeassistant/config.py
index c58f94ca197..a422cbea1d9 100644
--- a/homeassistant/config.py
+++ b/homeassistant/config.py
@@ -734,7 +734,7 @@ async def merge_packages_config(
                 continue
             # If component name is given with a trailing description, remove it
             # when looking for component
-            domain = comp_name.split(" ")[0]
+            domain = comp_name.partition(" ")[0]
 
             try:
                 integration = await async_get_integration_with_requirements(
diff --git a/homeassistant/helpers/check_config.py b/homeassistant/helpers/check_config.py
index 3bda89c9a73..bc17330f656 100644
--- a/homeassistant/helpers/check_config.py
+++ b/homeassistant/helpers/check_config.py
@@ -122,7 +122,7 @@ async def async_check_ha_config_file(  # noqa: C901
     core_config.pop(CONF_PACKAGES, None)
 
     # Filter out repeating config sections
-    components = {key.split(" ")[0] for key in config.keys()}
+    components = {key.partition(" ")[0] for key in config.keys()}
 
     # Process and validate config
     for domain in components:
diff --git a/homeassistant/helpers/entity_component.py b/homeassistant/helpers/entity_component.py
index f7f2b7e3dd3..1932c0397a1 100644
--- a/homeassistant/helpers/entity_component.py
+++ b/homeassistant/helpers/entity_component.py
@@ -36,7 +36,7 @@ _EntityT = TypeVar("_EntityT", bound=entity.Entity)
 @bind_hass
 async def async_update_entity(hass: HomeAssistant, entity_id: str) -> None:
     """Trigger an update for an entity."""
-    domain = entity_id.split(".", 1)[0]
+    domain = entity_id.partition(".")[0]
     entity_comp: EntityComponent[entity.Entity] | None
     entity_comp = hass.data.get(DATA_INSTANCES, {}).get(domain)
 
diff --git a/homeassistant/helpers/service.py b/homeassistant/helpers/service.py
index 138fa739794..ad90998cd7d 100644
--- a/homeassistant/helpers/service.py
+++ b/homeassistant/helpers/service.py
@@ -202,7 +202,7 @@ def async_prepare_call_from_config(
                 f"Template rendered invalid service: {domain_service}"
             ) from ex
 
-    domain, service = domain_service.split(".", 1)
+    domain, _, service = domain_service.partition(".")
 
     target = {}
     if CONF_TARGET in config:
diff --git a/homeassistant/helpers/trace.py b/homeassistant/helpers/trace.py
index bc3e7ff3565..3a5fb83395a 100644
--- a/homeassistant/helpers/trace.py
+++ b/homeassistant/helpers/trace.py
@@ -63,7 +63,7 @@ class TraceElement:
         """Return dictionary version of this TraceElement."""
         result: dict[str, Any] = {"path": self.path, "timestamp": self._timestamp}
         if self._child_key is not None:
-            domain, item_id = self._child_key.split(".", 1)
+            domain, _, item_id = self._child_key.partition(".")
             result["child_id"] = {
                 "domain": domain,
                 "item_id": item_id,
diff --git a/homeassistant/helpers/translation.py b/homeassistant/helpers/translation.py
index 616baeeea92..d1953b2fd00 100644
--- a/homeassistant/helpers/translation.py
+++ b/homeassistant/helpers/translation.py
@@ -97,10 +97,7 @@ def _merge_resources(
     # Build response
     resources: dict[str, dict[str, Any]] = {}
     for component in components:
-        if "." not in component:
-            domain = component
-        else:
-            domain = component.split(".", 1)[0]
+        domain = component.partition(".")[0]
 
         domain_resources = resources.setdefault(domain, {})
 
@@ -148,7 +145,7 @@ async def async_get_component_strings(
     hass: HomeAssistant, language: str, components: set[str]
 ) -> dict[str, Any]:
     """Load translations."""
-    domains = list({loaded.split(".")[-1] for loaded in components})
+    domains = list({loaded.rpartition(".")[-1] for loaded in components})
 
     integrations: dict[str, Integration] = {}
     ints_or_excs = await async_get_integrations(hass, domains)
diff --git a/homeassistant/setup.py b/homeassistant/setup.py
index d85e4043505..2be22910a08 100644
--- a/homeassistant/setup.py
+++ b/homeassistant/setup.py
@@ -433,7 +433,7 @@ def async_get_loaded_integrations(hass: core.HomeAssistant) -> set[str]:
         if "." not in component:
             integrations.add(component)
             continue
-        domain, platform = component.split(".", 1)
+        domain, _, platform = component.partition(".")
         if domain in BASE_PLATFORMS:
             integrations.add(platform)
     return integrations
@@ -458,10 +458,7 @@ def async_start_setup(
     time_taken = dt_util.utcnow() - started
     for unique, domain in unique_components.items():
         del setup_started[unique]
-        if "." in domain:
-            _, integration = domain.split(".", 1)
-        else:
-            integration = domain
+        integration = domain.rpartition(".")[-1]
         if integration in setup_time:
             setup_time[integration] += time_taken
         else:
diff --git a/homeassistant/util/__init__.py b/homeassistant/util/__init__.py
index 6562ecedb4f..315c8ebda74 100644
--- a/homeassistant/util/__init__.py
+++ b/homeassistant/util/__init__.py
@@ -156,7 +156,7 @@ class Throttle:
         # be prefixed by '.<locals>.' so we strip that out.
         is_func = (
             not hasattr(method, "__self__")
-            and "." not in method.__qualname__.split(".<locals>.")[-1]
+            and "." not in method.__qualname__.rpartition(".<locals>.")[-1]
         )
 
         @wraps(method)