Saving large assembly drawing as dwg file

Hello

Can anyone suggest a better way to do this? For our plant layout drawings, with the help of x64 windows vista machine and 12 GB RAM, we are able to manage solidworks drawings. 2 out of 3 times, when we try to make dwg out of this, it takes long time and then gives up. We have tried speedpak without success.

We are still on SolidWorks 2009 SP5.1. Is speedpak any better in 2010. I know it has lot of issues in 2009. I hope it got some improvements in 2010.

Thanks

SolidworksAssemblies