Minimum dLAN (Devolo etc.) bandwith for farming on mapped networkdrives?

[PatrickGlatt]

Hi,
I spreaded my plots on two computers which are in different rooms. 
Computer 1 is connected via dLan (Devolo) to the rooter and computer 2 via WLAN.

My problem is that the dLan has only ~20-30 Mbit download and 15-25 Mbit upload bandwidth. 
On computer 1, I mapped the plots of computer 2 as network drives. Means on computer 1 farmer is running and checking plots on computer 2 via slow dLan 20-30 Mbit/ 15-25 Mbit connection. 

Are 20-30 Mbit/ 15-25 Mbit enough to farm on mapped network drives or would I loose rewards because of beeing to slow (over 5 sec. etc)? 
What's the minimum bandwidth to farm on mapped network drives?