Slow copies to mapped network drive

Hi for some reason im noticing extremely slow transfer rates when copying to my mapped network drive. Im currently running Vista x64 Ultimate and writing to a dedicated Windows Home Server machine in the other room. The files that are usually 4-8GB's in size and it transfers at around 2-10MB/Sec.

It seems to be only related to how DOpus is handling the copying since using Vista explorer, I max out my gigabit at around 75MB/Sec regardless of what file im using.

I tried playing around with the buffer in file operations and it seems to affect the speed but still not up to Vista's speed. If I leave it at 64k, the file im testing with transfers at 2MB/Sec. If I raise it to 9999k, the transfer hits around 33MB/Sec, but if I lower the buffer to 16k, it makes it ultra slow at speed <1MB/Sec. Any ideas how to fix this problem? Is there something I need to configure in DOpus?

any ideas?

Only suggestion I can think of is checking for newer network card drivers. Perhaps the method that Opus copies data with has been sped up in later drivers. Probably not, but I can't think of much else to try if you're already played around with the buffer size.

Does copying similar files from the command prompt give you a similar speed to Opus?

(You could create a button to run an external copy tool, e.g. TeraCopy which might be faster with your particular network/hardware/etc.)

It looks like Teracopy is a nice workaround for my problem, the only issue I have is how would I change the hotkeys like Ctrl+C for copy to use teracopy as well? Is it possible to add a higher limit for the buffer in the next revision of DOpus so I could just raise the buffer to solve this issue rather than 3rd party tools?

Thanks