4 ms·

A good CDN provides "close" (network latency wise) servers so if there are 30 assets to be loaded, most are done over a 10 ms hop, not a 60 ms hop. Get a compl

by modoc 15y ago

A good CDN provides "close" (network latency wise) servers so if there are 30 assets to be loaded, most are done over a 10 ms hop, not a 60 ms hop. Get a complex page with 100+ assets, or try to serve it to another continent and the difference is even more impressive. Also if you're running a "busy" site off one server, it may not be busy enough to warrant a CDN's traffic off-loading perk. When you start talking about thousands and tens of thousands of requests per second, being able to off-load 80% of those requests makes a huge difference in how much hardware you need to deal with locally.

ck2 15y ago
There should not be 100 externally loading elements on an initial page load, ever. Any site does that needs to get a better developer.
- modoc 15y ago
  So say 50 elements. With a 50ms difference that's 2.5 seconds of total time. Most browsers will do 2-4 simultaneous connections, so let's say 4, that's still over 1/2 second faster page load. Now put that end user in Europe or Africa, and you're looking at 200-500 ms latency per call, versus 10 ms. You can see how the math works. Assets loaded on some of your recently submitted URLs: 21 - http://www.mozilla.org/en-US/firefox/10.0/releasenotes/ http://www.mozilla.org/en-US/firefox/10.0/releasenotes/ 60 - http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-... 104 - http://www.hollywoodreporter.com/thr-esq/falling-skies-lawsuit-tnt-font-285103 http://www.hollywoodreporter.com/thr-esq/falling-skies-lawsu... 282 - https://plus.google.com/u/0/111314089359991626869/posts/HQJxDRiwAWq https://plus.google.com/u/0/111314089359991626869/posts/HQJx... 54 - http://www.computerworld.com/s/article/9223601/Anonymous_dupes_users_into_joining_Megaupload_attack http://www.computerworld.com/s/article/9223601/Anonymous_dup... 67 - http://abcnews.go.com/blogs/politics/2012/01/rand-paul-in-pat-down-standoff-with-tsa-in-nashville/ http://abcnews.go.com/blogs/politics/2012/01/rand-paul-in-pa... 70 - http://www.wptavern.com/bad-behavior-in-the-wordpress-community http://www.wptavern.com/bad-behavior-in-the-wordpress-commun... etc.... The impact of reducing latency for each of those calls, and offloading those requests from your server(s) is a big deal for big sites.
  - ck2 15y ago
    Strong upvote for defending your argument with researched examples. I guess I am old school, I'd never serve that many elements on initial page load, CDN or not, that's crazy. Each additional DNS lookup can add up to 2 seconds if it's a cold cache-miss. Most modern browsers/servers use pipelining so it's not a 50ms connect each time. Different continent I might understand the desire. But I have a server in VA that can serve western Europe at 75-100ms connect time, which is not horrible.

by modoc 15y ago

ck2 15y ago

There should not be 100 externally loading elements on an initial page load, ever. Any site does that needs to get a better developer.

modoc 15y ago
So say 50 elements. With a 50ms difference that's 2.5 seconds of total time. Most browsers will do 2-4 simultaneous connections, so let's say 4, that's still over 1/2 second faster page load. Now put that end user in Europe or Africa, and you're looking at 200-500 ms latency per call, versus 10 ms. You can see how the math works. Assets loaded on some of your recently submitted URLs: 21 - http://www.mozilla.org/en-US/firefox/10.0/releasenotes/ http://www.mozilla.org/en-US/firefox/10.0/releasenotes/ 60 - http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-... 104 - http://www.hollywoodreporter.com/thr-esq/falling-skies-lawsuit-tnt-font-285103 http://www.hollywoodreporter.com/thr-esq/falling-skies-lawsu... 282 - https://plus.google.com/u/0/111314089359991626869/posts/HQJxDRiwAWq https://plus.google.com/u/0/111314089359991626869/posts/HQJx... 54 - http://www.computerworld.com/s/article/9223601/Anonymous_dupes_users_into_joining_Megaupload_attack http://www.computerworld.com/s/article/9223601/Anonymous_dup... 67 - http://abcnews.go.com/blogs/politics/2012/01/rand-paul-in-pat-down-standoff-with-tsa-in-nashville/ http://abcnews.go.com/blogs/politics/2012/01/rand-paul-in-pa... 70 - http://www.wptavern.com/bad-behavior-in-the-wordpress-community http://www.wptavern.com/bad-behavior-in-the-wordpress-commun... etc.... The impact of reducing latency for each of those calls, and offloading those requests from your server(s) is a big deal for big sites.
- ck2 15y ago
  Strong upvote for defending your argument with researched examples. I guess I am old school, I'd never serve that many elements on initial page load, CDN or not, that's crazy. Each additional DNS lookup can add up to 2 seconds if it's a cold cache-miss. Most modern browsers/servers use pipelining so it's not a 50ms connect each time. Different continent I might understand the desire. But I have a server in VA that can serve western Europe at 75-100ms connect time, which is not horrible.