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conf/mod-server-idler.conf.dist

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+#
+# Server Idler configuration
+#
+
+#  ServerIdler.Enable
+#    Description: Enable/disable the server idler module.
+#    Default:     1 - (Enabled)
+#                 0 - (Disabled)
+#
+ServerIdler.Enable = 1
+
+#  ServerIdler.IntervalIdle
+#    Description: Map update interval (in milliseconds) when NO players are online.
+#    Important:   Higher values = less CPU usage, but slower world updates.
+#    Default:     200
+#
+ServerIdler.IntervalIdle = 200
+
+#  ServerIdler.IntervalActive
+#    Description: Map update interval (in milliseconds) when at least one player is online.
+#    Important:   Typically matches or is close to your MapUpdateInterval in worldserver.conf.
+#    Default:     10
+#
+ServerIdler.IntervalActive = 10

src/mod_server_idler.cpp

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+#include "ScriptMgr.h"
+#include "Config.h"
+#include "World.h"
+#include "Player.h"
+
+namespace
+{
+    bool   sEnabled = true;
+    uint32 sIntervalIdle = 200u;
+    uint32 sIntervalActive = 10u;
+    uint32 sPlayersOnline = 0u;
+
+    void ApplyInterval()
+    {
+        if (!sEnabled)
+            return;
+
+        uint32 newInterval = (sPlayersOnline > 0) ? sIntervalActive : sIntervalIdle;
+        sWorld->setIntConfig(CONFIG_MAP_UPDATE_INTERVAL, newInterval);
+    }
+}
+
+class ServerIdler_WorldScript : public WorldScript
+{
+public:
+    ServerIdler_WorldScript() : WorldScript("ServerIdler_WorldScript") {}
+
+    void OnAfterConfigLoad(bool) override
+    {
+        sEnabled = sConfigMgr->GetOption<bool>("ServerIdler.Enable", true);
+        sIntervalIdle = sConfigMgr->GetOption<uint32>("ServerIdler.IntervalIdle", 200u);
+        sIntervalActive = sConfigMgr->GetOption<uint32>("ServerIdler.IntervalActive", 10u);
+
+        if (sIntervalIdle == 0u)
+            sIntervalIdle = 1u;
+        if (sIntervalActive == 0u)
+            sIntervalActive = 1u;
+
+        sPlayersOnline = sWorld->GetPlayerCount();
+        ApplyInterval();
+    }
+};
+
+class ServerIdler_PlayerScript : public PlayerScript
+{
+public:
+    ServerIdler_PlayerScript() : PlayerScript("ServerIdler_PlayerScript") {}
+
+    void OnLogin(Player*) override
+    {
+        if (!sEnabled)
+            return;
+
+        ++sPlayersOnline;
+        ApplyInterval();
+    }
+
+    void OnLogout(Player*) override
+    {
+        if (!sEnabled)
+            return;
+
+        if (sPlayersOnline > 0)
+            --sPlayersOnline;
+
+        ApplyInterval();
+    }
+};
+
+void AddSC_server_idler()
+{
+    new ServerIdler_WorldScript();
+    new ServerIdler_PlayerScript();
+}

src/mod_server_idler_loader.cpp

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+#include "ScriptMgr.h"
+
+void AddSC_server_idler();
+
+void Addmod_server_idlerScripts()
+{
+    AddSC_server_idler();
+}