Strange Lag?

[Lady Felix]

My friend has this issue when she's in game that other characters flicker away and then back whenever they move and sometimes when they don't. Her own character animation is smooth and besides that, there are no issues. She did notice, however, if she opened up another small window in front of EQ, the characters would solidify. Anyone know what is causing this and how to fix it? I can't imagine what's wrong.