wouldn't using ip instead of host name on a dedicated server make page load faster since you avoid the dns lookup? why isn't this done?
like using <script src="xxx.xxx.xxx.xxx/javascript.js> <img src=same thing <link href=same thing? ??
A:
It's not done because it's not practical and doesn't bring any sensible performance gain
Gregory Pakosz
2010-08-18 11:06:10
It typically takes 120 milliseconds for DNS to lookup the IP address for a given hostname. multiply this by un-parallel files and you get a different conclusion. and wow you responded fast!
jsd911
2010-08-18 11:08:49
as Darin said, the dns lookup is cached
Gregory Pakosz
2010-08-18 11:09:41
i dont know the yahoo http://developer.yahoo.com/performance/rules.html page says reduce dns lookup. what are they talking about?
jsd911
2010-08-18 11:12:04
they just say why which according to you guys is bs. and then don't say how!
jsd911
2010-08-18 11:12:41
it says "My guideline is to split these components across at least two but no more than four hostnames" which is likely to be the case for a normal site
Gregory Pakosz
2010-08-18 11:17:55