On Thu, May 05 2011, Ted Zlatanov wrote:

> Has anyone tested to see if DNS lookups are actually a problem?  Test an
> entirely local page vs. a page with lots of remote image URLs.  I don't
> see a difference on my machine.

In a web browser? Because they are parallelized and/or multi-threaded,
maybe?

> Typically DNS lookups are very fast and HTML pages don't have a huge mix
> of domains for the images they reference, so I think this is wasted
> effort *for the specific purpose of rendering HTML faster*.  I can't
> think of any practical uses within Emacs for async DNS lookups, either.

I may be wrong, but I disagree: they are usually fast, except when there
is a problem or you're behind a very slow link. Just because they are
serialized and synchronous.

OTOH, I agree that the only useful place for this enhancement is
probably HTML rendering…

-- 
Julien Danjou
❱ http://julien.danjou.info