workaround for slow emacs

see bbatsov/projectile#1183
if the system is mac, set clang as checker for flycheck

.emacs.d/settings/packages/linting.el

@@ -11,7 +11,8 @@
   (add-hook 'c++-mode-hook
             (lambda ()
               (setq flycheck-gcc-language-standard "c++14")
-              (setq flycheck-c/c++-gcc-executable "g++-6")
+              (if (system-is-mac)
+                (setq flycheck-c/c++-gcc-executable "clang++"))
               (flycheck-select-checker 'c/c++-gcc)
               )
             ) ;it does not interfere with c mode.

.emacs.d/settings/packages/project-mgnt.el

@@ -3,7 +3,11 @@
 (use-package projectile
   :ensure t
   :init
-  ;; config: enable cache and other settings?
+  ;; Workaround laggy emacs editor
+  ;; see https://github.com/bbatsov/projectile/issues/1183
+  (setq projectile-mode-line
+        '(:eval (format " Projectile[%s]"
+                        (projectile-project-name))))
   :config
   (projectile-global-mode)
   )