Does anyone know if there is any diference to resource usage and if so which is better resource wise, morphs or magnets?
My computer is old, slow, and short of ram so any improvement to rendering time is my objective.
Damn 20th century technology!

Magnets use less memory. But it depends on what you are trying to do.

If you have more morphs on one group try combining them with Morphmanager to one> per group Tony

My main interest is animation using Vue & Mover 4.22 for the final render, but the individual animation of models is prepared in Poser 4.03.

Main Machine
-P3 733mhz
-512 meg
Render cows
-P3 933
-P2 350
(all I can afford)

Magnets use less resources, and also allow you to move mesh about in Poser in ways that morphs can not. Magnets have a bit more learning curve, but once you get the knack for using them you will find them very useful. For those few occasions where a morph might actually work better, Poser allows you to spawn magnets to morphs, so it is possible to convert certain magnet set ups into morphs.