I'm using emacs "", with Prelude customization on Windows 7. I mainly use org-mode. I found that org-mode takes long delay to save buffer (save-buffer), as long as the edit is more than several dozen characters. It may take as long as 10 seconds, not able to continue editing.

I tried even with emacs -Q, it will still takes about 5 seconds.

(I also noticed that it takes long time to open and load org file.)

The file in question has about 500 lines, some of the lines may be long of about 200 hundred characters.

I also tried to increase gc-cons-threshold, but seems not effect.

I only have last option to go back to version 24.x to try my luck.

Could you please your insights or experience.


1 Answer 1


Try to profile your emacs configurations as follows:

  1. Run M-x profiler-start
  2. Edit your .org file for a while;
  3. Run M-x profiler-report to see the detailed time consumption of each function;
  4. Locate the package which the function that takes the most CPU time belongs to;
  5. Uninstall the package or comment out the configurations of that specific package
  • I noticed that it's being block, thus not necessarily using CPU, thus profiler-report would not much clue.
    – Yu Shen
    Commented Jun 1, 2016 at 14:28
  • Maybe some other processes take up your system disk IO? Try kill other irrelevant processes in your task manager.
    – Erdos Yi
    Commented Jun 1, 2016 at 14:38

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