SQL*Net wait events are pretty much idle events. Most times they can be ignored.

However, If you are pumping ALOT of data, tweaking the SDU/TDU parameters may help. The change is relatively transparent; change the tnsnames.ora on the client, change the listener.ora on the server and reload the listener.

I have experimented with SDU/TDU in my environment, but have not experienced a noticable improvement.