On some TBC servers, all meet objects (players, items, gameobjects, ...) seems to keeps in memory, if your character go to big city or if you running too long WRobot session the CPU usage can increment.
You can test if "/reload" resolve probleme (and run this macro sometimes)
You can also try this plugin Main.cs :
public class Main : wManager.Plugin.IPlugin
{
public void Initialize()
{
wManager.wManagerSetting.CurrentSetting.ReadObjectManagerFTS = 2;
}
public void Dispose()
{
}
public void Settings()
{
}
}
(you can change value line 5 (default WRobot value is 10))