Does Shockwave's preLoadMember actually cache?

Question

Hi -

I am trying to use Shockwave Director with a large 3D .w3d file. I load it like so:

on enterFrame me

if member(g3dMemberName).mediaReady = 1 then
  preLoadMember(member(g3dMemberName))
else
  go to the frame
end if

end

which seems to work fine. However, the w3d never seems to come from the user's local cache. The documentation for preLoadNetThing talks about the browser's cache but preLoadMember doesn't. Can they be used in conjunction somehow? Is preLoadMember caching, and something else is awry? Help! Using 1990's technology is killing me, Adobe, PLEASE add 3d capabilities to Flash!