Add variable dotspacemacs-verbose-loading

By default to nil.
Can speedup the loading process.

core/core-dotspacemacs.el

@@ -16,6 +16,9 @@
 (defconst dotspacemacs-filepath "~/.spacemacs"
   "Filepath to the installed dotfile.")
 
+(defvar dotspacemacs-verbose-loading nil
+  "If non nil output loading progess in `*Messages*' buffer.")
+
 (defvar dotspacemacs-configuration-layer-path '()
   "List of additional paths where to look for configuration layers.
 Paths must have a trailing slash (ie. `~/.mycontribs/')")

core/core-spacemacs-buffer.el

@@ -110,7 +110,8 @@ buffer, right justified."
 
 (defun spacemacs/message (msg &rest args)
   "Display MSG in message prepended with '(Spacemacs)'."
-  (message "(Spacemacs) %s" (apply 'format msg args)))
+  (when dotspacemacs-verbose-loading
+    (message "(Spacemacs) %s" (apply 'format msg args))))
 
 (defun spacemacs/insert-page-break ()
   "Insert a page break line in spacemacs buffer."

core/templates/.spacemacs.template

@@ -30,6 +30,8 @@ before layers configuration."
    ;; Either `vim' or `emacs'. Evil is always enabled but if the variable
    ;; is `emacs' then the `holy-mode' is enabled at startup.
    dotspacemacs-editing-style 'vim
+   ;; If non nil output loading progess in `*Messages*' buffer.
+   dotspacemacs-verbose-loading nil
    ;; Specify the startup banner. Default value is `official', it displays
    ;; the official spacemacs logo. An integer value is the index of text
    ;; banner, `random' chooses a random text banner in `core/banners'