Today I Got Much Lagg

plz help me bcs today i got much much laggs what can i do?

Specify which realm are you playing on. Check your personal network connection and any processes running in the background.

i playing in Deathwing and i dont running another processes in background i also restart modem all is ok browsing downloading but why got lagg

Are you the only one lagging? Or also other players. If it's just you, then it's a pure local network issue. If anyone is sharing your network, that could slow it down