Just FYI, NPC/Player Models don't cause lag just because they are high resolution.
Slightly off-topic: Anyone claiming 30 FPS on a laptop in 25m raids is bullshitting(unless playing at 800x600 or similar resolution), measure it during fight(with a program that measures average FPS, like FRAPS function) in a 25m Normal or Heroic raid with Particle Density set to High(as you need to see stuff) and Projected Textures on, not LFR or sitting in front of a boss.
My FPS on a i5-2500k(4.3Ghz) drops to 20-30 range depending on fight and on Tortos 25HC(we kite bats), at the end of a fight my screen actually freezes for a split second when I use my Multi-shot at the 50+ bat pack for the lols and whatever. Getting 40 FPS in a 25m Heroic raid in combat is out of the question on ANY PC in the world at 1920x1080 with "raider video settings"