fast emacs startup -- add the following to the beginning of your init.el

init.el

;; fast startup time
(setq gc-cons-threshold most-positive-fixnum)
(defvar original-file-name-handler-alist file-name-handler-alist)
(setq file-name-handler-alist nil)
(add-hook 'emacs-startup-hook
          #'(lambda () (setq gc-cons-threshold 800000
                             file-name-handler-alist original-file-name-handler-alist)))
;; (add-hook 'emacs-startup-hook
(add-hook 'after-init-hook
          (lambda ()
            (message "Emacs ready in %s with %d garbage collections."
                     (format "%.2f seconds"
                             (float-time
                              (time-subtract after-init-time before-init-time)))
                     gcs-done)))