bug#5833: 23.1.94; Opening files on network shares on w32 is slow

[Stefan Monnier]

>>  (setq locate-dominating-stop-dir-regexp "")
> That maybe shaves off half a second.

Hmm... odd.  That seemed like a pretty good guess
(locate-dominating-file tends to suffer from such performance problems
in some cases, and vc-handled-backends is one user of this function,
and dir-locals is another, so setting locate-dominating-stop-dir-regexp
should really kill it off).

> Again, hard to done any scientific tests using a physical stop watch.

That's OK.  When we find the culprit, it should bring the time down to
something significantly lower: no need for a stopwatch.


        Stefan