Use reduced texture resoutions. A 4000x4000 texture map is complete overkill when rendering to a 640x480 animation. Smaller textures load and render faster, and Poser is far less likely to run into memory problems. 1024x1024 is good enough for anything except extreme closeups, for background figures 512x512 is usually enough.
Use texture dimensions that are powers of 2 (256,512,1024,2048). Those are handled more efficiently.

Conforming clothes render exactly as fast as dynamic clothes at the same polygon count and texture map sizes. Hi-poly dynamic clothes might render somewhat slower.

Dynamic hair - this varies greatly. The dynamic hairstyles that comes with Poser 5 render very slow and gobble up RAM. The P6 dynamic hairstyles are significantly more efficient.
But the best dynamic hair for simulations is the hair made by kirwyn. Simulates blindingly fast using a proxy (2 seconds/frame or less!), and renders quickly, about as fast as transmapped hair.

If you have to use raytracing for one reason or another, set the property 'visible in raytracing' to OFF for actors that have transmaps. That greatly increases render speed. Same goes for dynamic hair.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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