Poor performance on a slow link

I've noticed that both 21.2.38 and 21.2.39 have a problem when there is a slow link like an ISDN line between the X Server and a copy of XEmacs running on Solaris. Some operations (such as copy-primary-selection or kill-line) transmit a lot more data than they should, around 30K. Other similar operations (such as advertized-undo) are very fast and transmit almost no data. I usually work with the Windows version of XEmacs and don't know much about X or the use of it by XEmacs so I don't know what's going on. I can send someone a trace of the traffic, but it should be easy to reproduce since it happens even with when XEmacs is run with -vanilla. I don't know when this started happening since I haven't built a Unix version for a while. I'm also behind in my EMail so this may have been discussed although I didn't see it in a quick scan. If it's an old topic, I apologize. Mike Alexander <mailto:mta＠arbortext.com> Arbortext, Inc. +1-734-997-0200