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Mar 19, 2016 at 23:54

I'd rather believed that XEmacs had user-defined reader macros. Turns out it doesn't, but it does defined two extra reader macros: #+ and #-

Jul 23, 2018 at 08:22

Interesting discussion of inefficiencies in elisp bytecode during function calls: https://www.xemacs.org/Architecting-XEmacs/faster-elisp.html (From the XEmacs site, but entirely applicable to GNU Emacs and Remacs too I think)

XEmacs: Making Elisp Function Calls Faster

XEmacs is a highly customizable open source text editor and application development system. It is protected under the GNU Public License and related to other versions of Emacs, in particular GNU Emacs. Its emphasis is on modern graphical user interface support and an open software development model, similar to Linux. XEmacs has an active development community numbering in the hundreds, and runs on Windows 95 and NT, Linux and nearly every other version of Unix in existence. This site provides links to all of the FTP sites mirroring XEmacs, contains the absolute latest version of the XEmacs FAQ, and has pointers to additional Elisp packages which work with XEmacs. This site is provided to help users get the most out of XEmacs.

Jan 21, 2017 at 00:50

TIL XEmacs has more datatypes! For example, a keymap is an opaque type rather than a list:

What functionality is missing in GNU Emacs when compared to XEmacs? - Emacs Stack Exchange

Mar 19, 2016 at 23:29

I've been reading XEmacs source code today. It's amazing how much the C code resembes the GNU version (but with more derogatory comments).