Hello list -- I’m reasonably happy with VM and large buffers since my changes back in December and January, passing through charcount information from coding systems to the lstream code, and using skip_ascii () in the no-conversion coding system. Now, there are further wins for other use cases to be had, e.g. using skip_ascii for the ascii-compatible fixed-width coding systems, but the big thing that’s slowing us down at the moment is the escape-quoted conversion in the autosave code. I find I’m rushing to save these big VM buffers by hand. I can’t see any similar optimization we can do that is compatible with escape-quoted. We can’t skip ASCII characters because the following characters are all ASCII, and they are the ones that get the preceding ?\x1b that is the whole point of escape-quoted: case ISO_CODE_ESC: case ISO_CODE_CSI: case ISO_CODE_SS2: case ISO_CODE_SS3: case ISO_CODE_SO: case ISO_CODE_SI: There’s no particular bit pattern I can come up with that matches most of ASCII and doesn’t match non-ASCII characters and these characters that need quoting. Something we could do to improve this would be to move our autosave files to UTF-8, where the skip_ascii optimization is available. Best, Aidan -- ‘Liston operated so fast that he once accidentally amputated an assistant’s fingers along with a patient’s leg, […] The patient and the assistant both died of sepsis, and a spectator reportedly died of shock, resulting in the only known procedure with a 300% mortality.’ (Atul Gawande, NEJM, 2012) _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta