I didn't know that Lynx won't display output before the page is loaded. I've never tried a slow web app using it.
I've had good results with IE,Netscape and Opera just printing a progress indiciator.
The only times I really have to do this are big data loads from our clients who are almost all MS based.
Like I said, not always the best solution but I think it works well in the majority of situations and is fairly reliable, though sometimes I use