This document provides instructions on how to build a content delivery network (CDN) to improve website performance. It discusses how page sizes and mobile traffic are increasing, causing slower load times. A typical website loads resources from a single web server, taking 10 seconds. Using a CDN can get content closer to users, load resources in parallel, and improve speeds. The document reviews existing CDNs and how to set up an on-premise or cloud CDN using technologies like Azure CDN, which can deliver content to users worldwide from multiple edge servers for faster load times.

1. How to build CDN for your
website
Martin Kulov
Microsoft Regional Director, VS ALM MVP

2. State of WWW today
Average page size is 25% bigger
From avg 626kB up to 784kB
For just one year!
Almost 1MB by the end of this year!

5. Website Users
Many have broadband network
Many of them do not
Mobile users are increasing
Tablets are going strong
All users expect page to load in ~2sec

6. US mobile data traffic

7. Page Load Time for Mobile

8. Typical web app today…
Loads in 10sec
Have ~80 resources (img, css, js)
Have just one web server

9. Webpage Waterfall – Fail

10. Connection View – Fail

11. What can you do today?
Get content closer to users
Load resources in parallel
Use Content Delivery Network (CDN)
aka Edge Caching Network (ECN)
Or built similar one by yourself

12. Webpage Waterfall – OK

13. Connection View – OK

14. Benefits
Increased Speed
Price Optimization
Load Balancing

15. Existing CDN
Microsoft Ajax CDN
http://www.asp.net/ajaxlibrary/cdn.ashx
Google Libraries
http://code.google.com/apis/libraries/
Telerik Extensions CDN
http://www.telerik.com/help/aspnet-mvc/web-assets-
telerik-cdn-support.html

16. Using On Premise CDN

17. How web works
DNS
Host
Web Server
IP
Home.aspx
Browser
HTML
gif, jpg, css, js
~ x80 ...

18. How web works with CDN
Web Server
DNS
Host Home.aspx
IP
HTML
Browser
...
gif, jpg, css, js
Edge Servers

19. DNS
geoDNS
Netmask ordering
Round robin

20. IIS
URL rewrite – response HTML
Caching – output, kernel
Static server
To blob or not to blob – MS Research
http://tinyurl.com/m5v3wc
Application Request Routing

21. DEMO: UrlRewrite and ARR

22. Using Cloud CDN

23. Windows Azure CDN
Move the content closest to clients
99.9% monthly SLA
Used by Windows Update, Bing
Maps…
Deliver static content
Deliver streaming media
22 locations in
US, Europe, Asia, Australia, and South

24. Setting up Azure CDN
Azure Subscription
Storage account
Blob container
Custom domain name

25. Pricing
$0.12/GB from Europe and North
America
$0.19/GB from other locations
$0.01/10,000 transactions
304 requests also generate traffic
Not enabled by default in IIS

26. DEMO: Window Azure CDN

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