bug#26402: 25.2; Font rendering extremely slow on any non-default font

[Gennady Uraltsev <gennady.uraltsev@gmail.com>]

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Hey,

Nope, sorry. Doesn't seem to help.  What I did:
started emacs with

#emacs -Q lorem-ipsum

emacs opens in fundamental mode with the file (attached)

# M-x eval-expression
# (setq inhibit-compacting-font-caches t)
# buffer-face-set
# variable-pitch

Slow as before. Attaching the profiler logs


On 08/04/17 16:44, Eli Zaretskii wrote:
> > From: Gennady Uraltsev <gennady.uraltsev@gmail.com>
> > Date: Sat, 8 Apr 2017 15:48:38 +0200
> >
> > Font rendering in emacs is incredibly slow if any buffer-local change is
> > made i.e. unless using 'default.
>
> Does setting inhibit-compacting-font-caches non-nil solve the problem?
> If it does, can you show an example of a buffer where you see this
> problem?
>


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[profiler-profile "24.3" cpu #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8 data ([redisplay sit-for execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 8 [default-font-height default-line-height line-move-partial line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil] 804 [default-font-height default-line-height window-screen-lines line-move-partial line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil] 750 [default-font-height default-line-height line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil] 670 [default-line-height line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 4 [default-line-height window-screen-lines line-move-partial line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil] 4 [line-move-visual line-move next-line funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 4 [completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 29 [image-search-load-path find-image eval "#<compiled 0x280363>" mapcar tool-bar-make-keymap-1 tool-bar-make-keymap redisplay_internal\ \(C\ function\) read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil] 4 [read-from-minibuffer completing-read-default completing-read read-extended-command byte-code call-interactively command-execute nil nil nil nil nil nil nil nil nil] 23 [complete-with-action "#<compiled 0x24c47d>" try-completion completion-basic-try-completion "#<compiled 0x4abe53>" completion--some completion--nth-completion completion-try-completion completion--do-completion completion--in-region-1 "#<compiled 0x249589>" apply "#<compiled 0x5cdc62b>" completion--in-region completion-in-region minibuffer-complete] 3 [execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil nil nil nil nil nil nil] 5 [profiler-cpu-profile profiler-report-cpu profiler-report funcall-interactively call-interactively command-execute execute-extended-command funcall-interactively call-interactively command-execute nil nil nil nil nil nil] 8 [Automatic\ GC] 5)) (22760 63749 353013 10000) nil]

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- command-execute                                                2313  99%
 - call-interactively                                            2313  99%
  - funcall-interactively                                        2257  97%
   - next-line                                                   2236  96%
    - line-move                                                  2236  96%
     - line-move-partial                                         1558  67%
      - default-line-height                                       804  34%
         default-font-height                                      804  34%
      - window-screen-lines                                       754  32%
       - default-line-height                                      754  32%
          default-font-height                                     750  32%
     - default-line-height                                        674  29%
        default-font-height                                       670  28%
       line-move-visual                                             4   0%
   - execute-extended-command                                      21   0%
    - sit-for                                                       8   0%
       redisplay                                                    8   0%
    - command-execute                                               8   0%
     - call-interactively                                           8   0%
      - funcall-interactively                                       8   0%
       - profiler-report                                            8   0%
        - profiler-report-cpu                                       8   0%
           profiler-cpu-profile                                     8   0%
  - byte-code                                                      56   2%
   - read-extended-command                                         56   2%
    - completing-read                                              56   2%
     - completing-read-default                                     56   2%
      - read-from-minibuffer                                       27   1%
       - redisplay_internal (C function)                            4   0%
        - tool-bar-make-keymap                                      4   0%
         - tool-bar-make-keymap-1                                   4   0%
          - mapcar                                                  4   0%
           + #<compiled 0x280363>                                   4   0%
- ...                                                               8   0%
   Automatic GC                                                     5   0%
 - minibuffer-complete                                              3   0%
  - completion-in-region                                            3   0%
   - completion--in-region                                          3   0%
    + #<compiled 0x5cdc62b>                                         3   0%

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