Copying text without touching X clipboard?

I've been having a problem with XEmacs putting text into the X clipboard that I don't want/need copied. I run XEmacs remotely over a DSL line, and every time I press M-d, C-backspace, C-k, M-w, etc. the program freezes because (I assume) it is transferring the XEmacs cut buffer to the X clipboard. This makes it unbearable to use, because the pauses are frequent and long. I was able to get rid of these pauses by setting the customize variable 'interprogram-cut-function' to 'none' -- but this completely nullified the copy function _within_ XEmacs as well. Is there a way to make XEmacs copy and paste within itself, but not with X? Or, does anyone have tips on other ways to get rid of the annoying pauses? Thanks, Michael