Speeding up upload speeds from ReadyNAS 312

Thanks Steve
I am maxing out my upload speeds from my ISP (dodo). I tested using testmy.net and results show uploads between 24KB/s (189kbps) to 87KB/s (699kbps)..v. slow. Guess I didn't realise this when deciding to install my own NAS but you live and learn. I use a pc so I couldn't use the tool you recommended. I have Virtual Box but I could not get it to connect to my server. Will keep trying on that note.

Giving the google a try but substituting for mac and result in full packet loss at 1462 but zero loss and 1452; so guessing my largest packet size is 1452 + 28 = 1480. Is this correct?

--- google.com ping statistics ---
5 packets transmitted, 0 packets received, 100.0% packet loss
Shedz-MacBook-Pro:~ Shed$ ping -c 5 -D -s 1462 google.com
PING google.com (74.125.237.163): 1462 data bytes
1470 bytes from 74.125.237.163: icmp_seq=0 ttl=57 time=117.094 ms
1470 bytes from 74.125.237.163: icmp_seq=1 ttl=57 time=114.757 ms
1470 bytes from 74.125.237.163: icmp_seq=2 ttl=57 time=114.629 ms
1470 bytes from 74.125.237.163: icmp_seq=3 ttl=57 time=114.443 ms
1470 bytes from 74.125.237.163: icmp_seq=4 ttl=57 time=113.767 ms

--- google.com ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 113.767/114.938/117.094/1.131 ms
Shedz-MacBook-Pro:~ Shed$ ping -c 5 -D -s 1452 google.com
PING google.com (74.125.237.163): 1452 data bytes
1460 bytes from 74.125.237.163: icmp_seq=0 ttl=57 time=113.910 ms
1460 bytes from 74.125.237.163: icmp_seq=1 ttl=57 time=117.839 ms
1460 bytes from 74.125.237.163: icmp_seq=2 ttl=57 time=114.217 ms
1460 bytes from 74.125.237.163: icmp_seq=3 ttl=57 time=114.642 ms
1460 bytes from 74.125.237.163: icmp_seq=4 ttl=57 time=114.473 ms

Thanks Steve.