When I open a big Org file which contains many different languages source 
blocks. And when the Org file buffer is fontified when option 
`org-src-fontify-natively` is enabled. Org will try to load those major modes. 
Including major-mode-hook like "clojure-mode-hook", "emacs-lisp-mode-hook", 
"python-mode-hook" etc. But for fontify the source blocks, I don't think it is 
necessary to load those major-mode-hooks. Also they are slow. Like in my case, 
most of time is used for loading source blocks major-mode-hooks.

- clojure-mode-hook has CIDER etc
- python-mode-hook has elpy etc
- emacs-lisp-mode-hook has some utilities.

Temporary disable those major-mode-hooks by set-local them to nil is a good 
solution to speed-up Org.

WDYT? If I'm wrong, please give out some thought from you. Thanks.

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