I guess that depends much on the network of the individual who does the reporting but most of the reports i've seen from users is general low performance of network speed (and several replying morphos devs reporting top-notch network speed on their machines)

In my case, on my 2 Macmini's and powerbook, my lan speed is average around 4-5 megabyte per second with morphos netstack.
OWB downloads jumps to 50kb/s to 3-400 kb/s

I can play with a cli and my nas mounted with smbfs and try
'copy nas:ubuntu10_04.iso buffer 1000000 ram:' and get 5-6-7 megabyte/s or
'copy nas:ubuntu10_04.iso buffer 10000000 ram:' and get 6-7-8-9 megabyte/s

When copying from the Morphos side to nas, its around 2 megabyte/s

my internet is 60 megabit up and down(fibre) or around 7 megabyte per second and browsing the web with OWB is usally slow, i did what Fab suggested somewhere to set tcp.sendspace and tcp.recvspace to 60000 for speeding up browsing, but then LAN filetransfers where really crap and halting so i had to revert to 8192 for tcp.sendspace and tcp.recvspace

I'll get this Roadshow 68K stack running for a few days and test if network speeds on WAN and LAN get any better.