The following picture is a snapshot while installing about 100M of programs on the laptop which took more than three hours. I recognised no problems.
/proc/net/dev
reported about 2% of lost
ppp-packets and in /var/log/messages
I also found
some lines about a "non responding server".
This is due to the weak serial chip on the laptop and no
big problem. It only means a bit more time for transfers.