优化Emacs启动时间

╼►[benchmark-init/root nil 6567ms]
  ├─[etags require 196ms]
  │ ╰─[xref require 204ms]
  │   ╰─[project require 218ms]
  ├─[company-dabbrev require 31ms]
  ├─[company-capf require 31ms]
  ├─[company-cmake require 78ms]
  ├─[company-clang require 78ms]
  ├─[company-eclim require 78ms]
  │ ╰─[company-template require 47ms]
  ├─[cl require 215ms]
  ├─[rx require 218ms]
  ├─[~/.emacs.d/company-statistics-cache.el load 0ms]
  ├─[company-statistics require 31ms]
  ├─[~\.emacs.d\abbrev_defs load 16ms]
  ├─[default load 281ms]
  ├─[paren load 250ms]
  ├─[cus-start require 204ms]
  ├─[cus-load require 218ms]
  ├─[init-better-defaults require 764ms]
  │ ├─[grep require 187ms]
  │ ├─[compile require 218ms]
  │ │ ╰─[comint require 203ms]
  │ │   ├─[ansi-color require 189ms]
  │ │   ╰─[ring require 203ms]
  │ ├─[ibuffer require 207ms]
  │ │ ╰─[ibuffer-vc require 78ms]
  │ │   ╰─[ibuf-ext require 200ms]
  │ ├─[thingatpt require 187ms]
  │ ├─[popwin require 141ms]
  │ ╰─[filenotify require 188ms]
  ├─[init-keybindings require 203ms]
  ├─[init-company require 0ms]
  ├─[init-cc-mode require 16ms]
  ├─[init-yasnippet require 422ms]
  │ ╰─[yasnippet require 219ms]
  ├─[init-elisp require 0ms]
  ├─[init-lisp require 78ms]
  ├─[init-hippie-expand require 0ms]
  ├─[init-ibuffer require 218ms]
  ╰─[init-elpa require 250ms]