Hi, well when its about SEO we hear about HTTP requests and DNS requests. As far as HTTP requests are concerned they are number of requests sent outside the site (external links) so if they are more it means that it will take the site more time to load BUT what here comes DNS into talk it is i guess the number of requests of external files from different servers e-g pics are at flickr, picassa javascript is at code (google) and then some stuff on own server. So the DNS requests would be all these providers (flickr,picassa,code google, own hosting) so if they increase the page load decreases. Now my questions are: 1- Do dns really effect? 2- How to get to know which server is good for us and which one is bad? 3- I have hosting in Host gator but still i host my java at code google as i think google will be faster than my hostgator (again because of no knowledge to findout which one is fast)? 4- Too many request from same DNS can make it slow, NOW HOW TO FIND OUT ABOUT THIS as which one is going to get slow and which one is not? 5- What is the limit to number of requests from same DNS?
Mate, just install Google's Page Speed addon for Chrome or Firefox and then go through optimising your site based on its findings. Sure a CDN for images can help (not necessarily Flickr). Also minified and combined javascript and CSS. Also compressed (your javascript, css and html, too). If you have a Blog/CMS, then the chances are an addon exists for it do a lot of this for you. As for SEO - it matters for Google (but not Bing), but to what degree I couldn't say. Page loading speed is just one part of SEO, so don't get too hung-up on it. Implementing the Page Speed recommendations will help. Unless your site is very high traffic, a CDN won't matter much for you. Good luck, mate.