Slow Network w/ CNet

[Oleg Green <ogreen tsi bc ca>]

Hi!
I have strange problem with slow telnetting to other computers from Linux
7.2.
After I get connected to remote computer, each letter (root) comes after
7-10 sec., after typing.
I install 5 computers (with Identical HardWare) with Linux 7.2
All of them have NIC CNet 10/100.
After I change NIC to 3COM, problem disappears.
Here is /etc/modules.conf for CNet card: 
alias parport_lowlevel parport_pc
alias sound-slot-0 i810_audio
post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null
2>&1 || :
pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null
2>&1 || :
alias usb-controller usb-uhci
alias eth0 tulip

Please give some advise how to fix the problem!