Poser meshes have the highest polycount & larg textures.
Games like Second Life have the smalest polycount ,small textures.

Ya would need to reduce a Poser mesh buy 90% to get it small enuff to get it to work in Second Life.The mesh would look bad.if it bends you would need to retopology it .

Then ya would need to shrink n strip the textures.so they would look very plain.
So ya would half to redo the texture to look desent.

There causing there selfs more work then if they just straight out made the mesh n textures from the start them selfs.

 

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance