3d Rendering By autodesk in its beta stage but it works great
http://neon.labs.autodesk.com/
thats the autodesk labs Project and you just upload your dwg files to autodesk and render
all you need to do is export your dwg into etransmit files with the
etransmit command
and then upload the zip file
and choose the quality and then the resolution
autodesk's Servers/ Super computers will render everything precisely and in 1/4 1/8 1/16 the time it will take a core 2 duo and most core i7s
its awesome give it a try
you must have at least 1 named view and
1 light in order to render
so create a camera and a light if you dont have one
ive got a sample file
its simple but its rendered at 1920 * 1080
and it took a shorter time period than it would take my core i7 laptop