--- a/.emacs-my	Sat Oct 03 22:46:26 2020 +0300
+++ b/.emacs-my	Tue Oct 13 20:51:39 2020 +0300
@@ -2664,7 +2664,8 @@
   (setq magit-log-margin '(t "%F %H:%M" magit-log-margin-width t 18))
   (define-key magit-mode-map [s-tab] nil))
 
-(setq magit-diff-refine-hunk t)
+;; No only it is slow in Cygwin it is also fails on some hunks...
+(setq magit-diff-refine-hunk nil)
 
 (with-eval-after-load 'magit-branch
   (remove-hook 'find-file-hook 'magit-edit-branch*description-check-buffers))