Optimise some member and user related routines.

* Skip user update if possible
* Drop copy.copy in favour of manual copy

Credit to Hornwitser for these findings.

discord/member.py

@@ -178,6 +178,20 @@ class Member(discord.abc.Messageable, _BaseUser):
     def __hash__(self):
         return hash(self._user)
 
+    @classmethod
+    def _copy(cls, member):
+        self = cls.__new__(cls) # to bypass __init__
+
+        self._roles = utils.SnowflakeList(member._roles, is_sorted=True)
+        self.joined_at = member.joined_at
+        self.status = member.status
+        self.guild = member.guild
+        self.nick = member.nick
+        self.activity = member.activity
+        self._state = member._state
+        self._user = User._copy(member._user)
+        return self
+
     async def _get_channel(self):
         ch = await self.create_dm()
         return ch
@@ -205,6 +219,7 @@ class Member(discord.abc.Messageable, _BaseUser):
         self.status = try_enum(Status, data['status'])
         self.activity = create_activity(data.get('game'))
 
+        if len(user) > 1:
             u = self._user
             u.name = user.get('username', u.name)
             u.avatar = user.get('avatar', u.avatar)

discord/state.py

@@ -449,7 +449,7 @@ class ConnectionState:
             member = Member(guild=guild, data=data, state=self)
             guild._add_member(member)
 
-        old_member = member._copy()
+        old_member = Member._copy(member)
         member._presence_update(data=data, user=user)
         self.dispatch('member_update', old_member, member)
 

discord/user.py

@@ -91,6 +91,19 @@ class BaseUser(_BaseUser):
     def __hash__(self):
         return self.id >> 22
 
+    @classmethod
+    def _copy(cls, user):
+        self = cls.__new__(cls) # bypass __init__
+
+        self.name = user.name
+        self.id = user.id
+        self.discriminator = user.discriminator
+        self.avatar = user.avatar
+        self.bot = user.bot
+        self._state = user._state
+
+        return self
+
     @property
     def avatar_url(self):
         """Returns a friendly URL version of the avatar the user has.