Lag in Dalaran is one of those things that has plagued WoW ever since it hit the live servers. There is not really anything you can do about it. It has to do with how many people are in the city at the same time. The servers just aren't quite capable of putting up with several hundred people in the same area at the same time.
Wintersgrasp used to be the same way during battles, then blizzard put in mechanics to limit the number of people that can take part in the battle. This helped quite alot.
One thing that you could try is upgrading your computer's RAM and Video Card. This is not a guaranteed fix though, as even people with top of the line computer systems can lag a bit in Dalaran.
add more ram
Get Game Booster 3.
To get DeSmuME to stop lagging, go to Configuration, then Frameskip. Set the frameskip to 9, and limit the frame rate. That should get DeSmuME to a speed where it almost never lags, and never goes too fast.
No i dont think so that there is any app if ur mob. Is lagging clear ram or use clean master or uninstall un necessary apps
Turn the graphix down or get a better computer.
Get a job and buy a better internet router.
In Dalaran's Alliance or Horde Building
Try servers that aren't as busy. Or try a different computer if possible.
The lagging strand.
Lagging is a gaming term that refers to a slow internet connection. When your or other people's characters seem to stop in place, then appear several steps ahead, that is when you know you are lagging. This happens because your internet connection is too slow to update the game in a timely manner.
use more impedense load and use suitable capacitor bank with the load.
get a faster internet and/or get anew PC