Elsewhere in this thread, Steve proposed trying --use-union-type. I did - no joy. I still see the same hang when attempting to delete a large (262,500 byte) chunk of text. Here's my config: uname -a: SunOS ise3 5.5.1 Generic_103640-22 sun4u sparc /u/shelton/new/src/xemacs-21.4-2001-11-05-union/configure '--prefix=/u/shelton/new/SunOS-5.5/xemacs-21.4-2001-11-05-union' '--with-gcc' '--site-includes=/u/shelton/new/SunOS-5.5/include' '--site-libraries=/u/shelton/new/SunOS-5.5/lib' '--infopath=/u/shelton/new/info' '--with-mule=no' '--compiler=gcc' '--cflags=-O2 -pipe -ffast-math -fno-exceptions' '--with-dialogs=no' '--with-widgets=no' '--package-path=/u/shelton/new/site-packages::/u/shelton/new/xemacs-packages' '--use-union-type' XEmacs 21.4.5 "Civil Service" configured for `sparc-sun-solaris2.5.1'. Compilation / Installation: Source code location: /u/shelton/new/src/xemacs-21.4-2001-11-05-union Installation prefix: /u/shelton/new/SunOS-5.5/xemacs-21.4-2001-11-05-union Additional header files: /u/shelton/new/SunOS-5.5/include Additional libraries: /u/shelton/new/SunOS-5.5/lib Runtime library search path: /u/shelton/new/SunOS-5.5/lib:/usr/dt/lib:/usr/openwin/lib Operating system description file: `s/sol2.h' Machine description file: `m/sparc.h' Compiler: gcc -O2 -pipe -ffast-math -fno-exceptions Relocating allocator for buffers: yes GNU version of malloc: yes Window System: Compiling in support for the X window system: - X Windows headers location: /usr/dt/include /usr/openwin/include - X Windows libraries location: /usr/dt/lib /usr/openwin/lib - Handling WM_COMMAND properly. Using Lucid menubars. Using Lucid scrollbars. TTY: Images: Compiling in support for GIF images (builtin). Compiling in support for XPM images. Compiling in support for PNG images. Sound: Databases: Compiling in support for DBM. Internationalization: Mail: Compiling in support for "dot-locking" mail spool file locking method. Other Features: Compiling in support for ToolTalk. Compiling in support for dynamic shared object modules. Using the union type for Lisp_Objects. -- In a minute there is time For decisions and revisions which a minute will reverse. T.S. Eliot [URL: http://www.cs.amherst.edu/~ccm/prufrock.html]