Comments on: Speed Tips: Use Multiple SubDomains

By: non

non — Fri, 07 Aug 2009 15:20:03 +0000

I’d like to use godaddy subdomain host on dreamhost, too.

By: Marcin

Marcin — Sat, 25 Jul 2009 18:09:52 +0000

@Ajay:

Yes, it would be, but thanks to this solution, browser can download files asynchronously, what will result in faster page load time.

By: Tom

Tom — Sun, 03 May 2009 15:55:45 +0000

Afaik the concurrent connection limit for IE / Mozilla is 2, which alone makes the benefit of this technique moot.

But even the browser could connect to 10 hosts at once, what’s to stop it connecting to the same host 10 times? It will do this automatically if it decides it’ll help performance.

Also remember that Apache and other servers will do Keep-alive on those connections, which eliminates the TCP/IP overhead of additional requests to the same host. You lose this benefit if you spread the requests. This cost gets higher the worse latency gets.

By: alex

alex — Wed, 14 Jan 2009 09:30:49 +0000

Thatx a lot for article!

Some words about comments:
don`t forget about *.domain.com A fields in name servers which describes a lot of subdomains.
that can be very impressive and fury if you want to create them with just 1!(or 2 if you not use www.) dns query(ies).
also you can use special subdomain to describe a group of subdomains…
4example:
subdomains z.s.askapache.com, f.s.askapache.com
- and just one A record *.s.askapache.com
… two dns queries. and a lot of subdomains available now. )

amazing)…

By: zuborg

zuborg — Thu, 16 Oct 2008 08:38:47 +0000

More domains mean more additional delays to resolve these domains. Anyway 3-6 such additional domains for images can strongly speedup your site loading speed if there is a lot of images to load.
You can also do tests using tools like http://Site-Perf.com/ or YSlow to see what exactly cause your site to load so long time.

By: Mirang

Mirang — Fri, 03 Oct 2008 06:45:29 +0000

Do the subdomains need to have unique ip addresses?
On a hosted account,you would normally have a shared ip,and the subdomain would also have the same ip as the domain.would the benfits be the same in that case too?

By: julien

julien — Mon, 15 Sep 2008 03:38:10 +0000

Well…well…

What is the conclusion then? we have people saying it’s good and others bad. And from the same host in one case (dreamhost).

Maybe benchmark would be needed, no? or maybe explain that this technique might be good for DV or VPS but not for shared servers.

Or maybe it’s good for low traffic site and not heavy traffic or vice versa

Are there any guru out there that can share their knowledge and not just their experience as it’s seem to vary from one site to another.

i dunno, i am just trying to figure out what’s best.

cheers

By: tandys

tandys — Wed, 10 Sep 2008 02:11:56 +0000

I have been trying to do this with my Joomla site, but alas, Joomla doesn’t allows such trickery. I am now getting quotes from component developers to try to bring such features to Joomla.

By: Richard X. Thripp

Richard X. Thripp — Sun, 24 Aug 2008 20:39:28 +0000

This is not a good idea. Each subdomain requires a separate DNS request, which makes the site slower. This is exactly the opposite of what you should do for a faster website.

Real speed benefits come from things like cached gzipping, merging CSS and JavaScript files, CSS sprites, moving JavaScript to the bottom of the page, and far-future HTTP expires headers, not this.

By: juylien

juylien — Thu, 14 Aug 2008 02:03:43 +0000

Thanks Kevin for pointing this. Good post. It’s always good to know the limitation of each technique.

Pardon my question, cause i am just a novice who just love to learn more about all this; but you are more talking about a large site with high traffic, right?