Hello,
When:
1. Starting Cygwin Emacs,
2. Opening whichever local file (`org-mode/lisp/org.el', in my case),
and
3. Keeping constantly our index on the Down arrow key to make the buffer
scroll indefinitely,
Emacs blocks (after 30 seconds scroll or so) for 5 entire seconds, and
then revives...
I've tracked down this problem in Cygwin Emacs, and it's due to this
line:
--8<---------------cut here---------------start------------->8---
(global-auto-revert-mode 1) ; Auto refresh buffers.
--8<---------------cut here---------------end--------------->8---
When it's commented, Cygwin Emacs behaves normally.
Note the above line does NOT cause any trouble in Windows Emacs...