Execution time in the backend is not all there is to the speed of a web application. In this talk, we'll look at the basic enhancements we can make to get an applications that truly feels snappy!

14. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Wed, 23 Feb 2011 17:00:00 GTM
Content-Length: 453

15. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Content-Length: 453

16. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Content-Length: 453

17. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
If-Modified-Since: Thu, 30 Sep 2011 17:00:00 GTM
HTTP/1.1 304 Not Modified
Content-Type: text/html; charset=UTF-8
Last-Modified: Wed, 23 Feb 2011 17:00:00 GTM

18. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
If-Modified-Since: Thu, 30 Sep 2011 17:00:00 GTM
HTTP/1.1 304 Not Modified
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM

28. <img src="data:image/gif;base64,R0lGODlhEAAOALMAAOazToeH
h0tLS/7LZv/0jvb29t/f3//Ub//ge8WSLf/rhf/3kdbW1mxsbP/
5UUde0ECwLJoExKcppV0aCcGCmTIHEIUEqjgaORCMxIC6e0Ccgu
Ww6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj"
width="16"
height="14"
alt="Play">

36. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Wed, 23 Feb 2011 17:23:32 GTM
Expires: Wed, 23 Feb 2011 19:23:32 GTM

37. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Expires: Thu, 30 Sep 2011 21:00:00 GTM

38. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Expires: Thu, 30 Sep 2021 21:00:00 GTM

41. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Cache-Control: max-age=315360000

42. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Cache-Control: max-age=315360000

43. HTTP/1.1 200 OK
Content-Type: application/x-javascript
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Cache-Control: max-age=315360000

46. <FilesMatch ".(gif|jpg|js|css)">
ExpiresDefault "access plus 10 years"
</FilesMatch>

52. GET /nelm.io/pierre
HTTP/1.1
HOST: nelm.io
Accept-Encoding: gzip,deflate
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Content-Length: 453
Content-Encoding: gzip

64. HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Wed, 23 Feb 2011 17:00:00 GTM
Content-Length: 453
Content-Encoding: gzip
Vary: Accept-Encoding

65. HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Last-Modified: Thu, 30 Sep 2011 17:00:00 GTM
Content-Length: 453
Content-Encoding: gzip
Vary: Accept-Encoding

68. As of February 2010, estimates of IE6's
global market share ranged from 10-20%.
Nonetheless, IE6 continues to maintain a
plurality or even majority presence in the
browser market of certain countries,
notably China and South Korea.
- Wikipedia

70. Vary: *
Cache-Control: private

71. Vary: *
Cache-Control: private

86. document.write

94. width: expression(document.body.clientWitdh < 600 ? “600px” : “auto”);
min-width: 600px;

121. GET /nelm.io/foo.js GET /nelm.io/foo.js
HOST: nelm.io HOST: nelm.io
If-Modified-Since: [...]
If-None-Match: 10f24bc-4ab
HTTP/1.1 200 OK HTTP/1.1 304 Not Modified
Last-Modified:[...]
ETag: 10f24bc-4ab-457e1c1f

122. GET /nelm.io/foo.js GET /nelm.io/foo.js
HOST: nelm.io HOST: nelm.io
If-Modified-Since: [...]
If-None-Match: 10f24bc-4ab
HTTP/1.1 304 Not Modified
HTTP/1.1 200 OK
ETag: 10f24bc-4ab-457e1c1f

123. GET /nelm.io/foo.js GET /nelm.io/foo.js
HOST: nelm.io HOST: nelm.io
If-None-Match: 10f24bc-4ab
HTTP/1.1 304 Not Modified
HTTP/1.1 200 OK
ETag: 10f24bc-4ab-457e1c1f

124. GET /nelm.io/foo.js GET /nelm.io/foo.js
HOST: nelm.io HOST: nelm.io
If-None-Match: 10f24bc-4ab
HTTP/1.1 304 Not Modified
HTTP/1.1 200 OK
ETag: 10f24bc-4ab-457e1c1f

125. HTTP/1.1 200 OK
ETag: 10f24bc-4ab-457e1c1f