This is less costly.

src/main/java/com/gmail/nossr50/party/commands/PartyJoinCommand.java

@@ -5,8 +5,8 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
+import com.gmail.nossr50.mcMMO;
 import com.gmail.nossr50.datatypes.McMMOPlayer;
-import com.gmail.nossr50.datatypes.PlayerProfile;
 import com.gmail.nossr50.locale.LocaleLoader;
 import com.gmail.nossr50.party.Party;
 import com.gmail.nossr50.party.PartyManager;
@@ -70,14 +70,12 @@ public class PartyJoinCommand implements CommandExecutor {
         mcMMOTarget = Users.getPlayer(targetName);
 
         if (mcMMOTarget == null) {
-            PlayerProfile playerProfile = new PlayerProfile(targetName, false);
-
-            if (!playerProfile.isLoaded()) {
-                sender.sendMessage(LocaleLoader.getString("Commands.DoesNotExist"));
+            if (!mcMMO.p.getServer().getOfflinePlayer(targetName).isOnline()) {
+                sender.sendMessage(LocaleLoader.getString("Party.NotOnline", targetName));
                 return false;
             }
 
-            sender.sendMessage(LocaleLoader.getString("Party.NotOnline", targetName));
+            sender.sendMessage(LocaleLoader.getString("Commands.DoesNotExist"));
             return false;
         }