> I cannot reproduce this. Did you try "emacs -Q"?
Yes, the behavior I've described happens to me in emacs -Q (and emacs -q)
> Please load mwheel.el (NOT the .elc file!), and then profile the slow
> scrolling again and show a fully-expanded profile. That might help us
> understand what part of mwheel-scroll takes the lion's share of CPU
> cycles.
Here's whole report expanded (btw can't find if there's expand-all feature?):
11593 91% - command-execute
11549 91% - funcall-interactively
11542 91% - mwheel-scroll
11536 91% - let*
11420 90% - condition-case
11381 90% - unwind-protect
11377 90% - let
11373 90% - cond
11372 90% - condition-case
10868 86% - funcall
324 2% - scroll-down
263 2% - jit-lock-function
255 2% - jit-lock-fontify-now
235 1% - jit-lock--run-functions
233 1% - #<compiled -0x152f649d2893cb7b>
232 1% - font-lock-fontify-region
224 1% - font-lock-default-fontify-region
132 1% - font-lock-fontify-syntactically-region
110 0% syntax-ppss
10 0% - lisp-font-lock-syntactic-face-function
7 0% - lisp-string-in-doc-position-p
1 0% forward-sexp
2 0% - lisp-string-after-doc-keyword-p
2 0% - backward-sexp
2 0% forward-sexp
35 0% - font-lock-fontify-keywords-region
17 0% - lisp--el-match-keyword
2 0% - lisp--el-non-funcall-position-p
1 0% syntax-ppss
5 0% #<compiled -0x4e6368f210a40dc>
1 0% - let
1 0% - cond
1 0% eq
1 0% font-lock-prepend-text-property
1 0% lisp--match-confusable-symbol-character
6 0% font-lock-unfontify-region
24 0% - eval
18 0% - if
3 0% display-graphic-p
2 0% - unless
1 0% if
1 0% mode-line-eol-desc
502 3% - unwind-protect
502 3% - funcall
5 0% - scroll-down
4 0% - eval
4 0% if
4 0% - if
2 0% if
6 0% - message
4 0% - error-message-string
3 0% - substitute-command-keys
1 0% #<compiled -0x1fc73df3077c5a73>
1 0% clear-minibuffer-message
57 0% - if
50 0% - progn
46 0% - setq
39 0% - run-with-timer
33 0% - run-at-time
4 0% - timer-set-time
1 0% timer--time-setter
1 0% timer-activate
3 0% *
2 0% if
3 0% - let
2 0% - while
1 0% - consp
1 0% - setq
1 0% car-safe
49 0% - mouse-wheel--get-scroll-window
48 0% - or
47 0% - catch
45 0% - let*
44 0% - if
39 0% progn
4 0% mwheel-event-window
1 0% - delq
1 0% - delq
1 0% delq
5 0% - eval-_expression_
5 0% progn
42 0% - byte-code
29 0% - read--_expression_
2 0% - redisplay_internal (C function)
2 0% - funcall
2 0% - #<compiled 0x4f9dac7e18824a>
2 0% - gui-backend-selection-exists-p
2 0% - apply
2 0% #<compiled -0x16887ad6f3ef152d>
1 0% - frame-windows-min-size
1 0% window-min-size
976 7% - ...
976 7% Automatic GC
13 0% - timer-event-handler
13 0% - apply
13 0% - #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_11>
13 0% - eldoc-print-current-symbol-info
13 0% - eldoc--invoke-strategy
13 0% - eldoc-documentation-default
13 0% - elisp-eldoc-funcall
13 0% - elisp--fnsym-in-current-sexp
13 0% - elisp--beginning-of-sexp
13 0% - forward-sexp
4 0% - scan-sexps
4 0% syntax-ppss
11 0% - jit-lock--antiblink-post-command
11 0% syntax-ppss
5 0% - undo-auto--add-boundary
4 0% - undo-auto--boundaries
2 0% undo-auto--ensure-boundary
3 0% - mwheel-filter-click-events
2 0% - if
2 0% eq
3 0% internal-timer-start-idle
3 0% tooltip-hide
2 0% - redisplay_internal (C function)
1 0% - funcall
1 0% - #<compiled 0x4f9dac7e18824a>
1 0% - gui-backend-selection-exists-p
1 0% - apply
1 0% #<compiled -0x16887ad6f3ef152d>
1 0% - jit-lock-function
1 0% - jit-lock-fontify-now
1 0% - jit-lock--run-functions
1 0% - #<compiled -0x152f64ab9864c87b>
1 0% - font-lock-fontify-region
1 0% - font-lock-default-fontify-region
1 0% - font-lock-fontify-syntactically-region
1 0% syntax-ppss
2 0% - #<compiled 0x1cf15f5a0be052d1>
1 0% - filter-buffer-substring
1 0% - buffer-substring--filter
1 0% - #<compiled 0x1f88987120b96adb>
1 0% apply
Also, I've attached a video of what I'm doing.
--
Best regards,
Andrey Listopadov