Make raw_host and port cached_property

CHANGES/1044.misc.rst

@@ -0,0 +1,3 @@
+``raw_host`` and ``port`` are now ``cached_property`` -- by :user:`bdraco`.
+
+``aiohttp`` accesses these properties quite often, which cause ``urllib`` to build the ``_hostinfo`` property every time. ``raw_host`` and ``port`` are now cached properties, which will improve performance.

yarl/_url.py

@@ -521,7 +521,7 @@ def password(self):
         """
         return self._UNQUOTER(self.raw_password)
 
-    @property
+    @cached_property
     def raw_host(self):
         """Encoded host part of URL.
 
@@ -549,7 +549,7 @@ def host(self):
             return raw
         return _idna_decode(raw)
 
-    @property
+    @cached_property
     def port(self):
         """Port part of URL, with scheme-based fallback.