Make sure shaders are off. To do this, go to Setup -> Options -> set "Shaders" to 0.
"Call yourself alive? I promise you you'll be deafened by dust falling on the furniture,
you'll feel your eyebrows turning to two gashes, and your shoulder blades will ache for want of wings."
Mine doesn't lag even then, but i'm packing raided HDD (2 SATAs working as one ) so it's practically operating at the speed of SCSI <.< but i'm just pimping my gear.