ReadyNas Remote painfully slow!

I think the source of your problem is the SMB protocol version that the ReadyNAS uses. Linux distros that are not using Samba 3.5 or higher are using the SMB 1 protocol which has a 64k block limit. With the TCP/IP overhead, that works out to around 60k in real life. SMB 2 and higher (Windows 7 is at SMB 2.1) don't have this limitation and is a major revision of the SMB protocol eliminating a lot of the overhead.

Unfortunately there isn't a way to fix it. If you want better throughput, you should check out using FTP instead. You lose some of the navigation convenience but you will gain better performance.

This problem will also occur when transferring files between Windows XP (SMB 1) and Windows 7 (SMB 2.1) so it's not just a Linux issue.

Also, the authentication is different between SMB 1 and SMB 2.x
If you end up having issues on any of your Windows 7 clients which spotty connection or problems authenticating, you should check out my other post...
http://www.readynas.com/forum/viewtopic.php?f=75&t=58551

Regards,
Muldune