> > --8<---------------cut here---------------start------------->8--- > (progn > (require 'tramp-sh) > (tramp-cleanup-all-connections) > (elp-instrument-list '(completion-all-completions > tramp-handle-file-name-completion tramp-sh-handle-file-name-all-completions)) > (setq unread-command-events (mapcar 'identity > "///ssh:fencepost:/\tgd/g\tnuorg/\tcopyright.list\n")) > (call-interactively #'find-file) > (elp-results) > (elp-reset-all)) > --8<---------------cut here---------------end--------------->8---
Thanks very much for this much improved testing code (which also saves the tedium of slowly retyping!). I altered it slightly to include a few more function, and target my local wired server: (progn (require 'tramp-sh) (tramp-cleanup-all-connections) (elp-instrument-list '(file-exists-p completing-read read-file-name-internal read-file-name-default tramp-handle-file-name-completion tramp-sh-handle-file-name-all-completions)) (setq unread-command-events (mapcar 'identity "///ssh:datpi:/home/pi/no\tex\t/do\tma\tce\t\n")) (call-interactively #'find-file) (elp-results) (elp-reset-all)) My timing results (emacs -Q, v27.2): From *scratch*: read-file-name-default 1 6.600062 6.600062 completing-read 1 6.507604 6.507604 read-file-name-internal 17 1.386566 0.0815627058 tramp-handle-file-name-completion 6 0.771607 0.1286011666 tramp-sh-handle-file-name-all-completions 6 0.72563 0.1209383333 file-exists-p 16 0.0443550000 0.0027721875 From remote dired: read-file-name-default 1 0.877973 0.877973 completing-read 1 0.873579 0.873579 tramp-handle-file-name-completion 6 0.735771 0.1226284999 tramp-sh-handle-file-name-all-completions 6 0.716579 0.1194298333 read-file-name-internal 17 0.039287 0.002311 file-exists-p 16 0.0167529999 0.0010470624 So really only very little difference inside the tramp completion functions; they seem to be doing the same job independent of the starting point. But the completing-read itself, which is where find-file is spending its time, is taking 8x longer! And read-file-name-internal is 35x slower. Do you find this as well? I’ll dig a bit deeper and see if I can narrow it down further.
