- From: Henry S. Thompson <ht@inf.ed.ac.uk>
- Date: Wed, 13 Jun 2012 20:36:37 +0100
- To: www-tag@w3.org
Some discussion at the TAG f2f involved glancing reference to the
question of whether SPDY would improve browser (user) experience.
I did a _tiny_ experiment to just see what kind of numbers I would
find. Here are the results. I offer them more as a stimulus to
thinking about just how complicated it is to get a handle on the above
question, how many conditions have to be controlled for, etc., than
anything else.
I also am aware that there are serious efforts underway to do this
'properly' -- this is rank amateurism.
ht
------------------
Fetching www.weather.com on 2012-06-13 produces 119 requests according
to fiddler, and then starts polling for some updating flash frame(s).
Response codes are as follows:
112 200
1 204
6 302
--------
Sites are as follows:
34 i.imwx.com
14 s.imwx.com
12 www.weather.com
9 ad.doubleclick.net --- 69 == 58%
7 b.imwx.com
7 d.imwx.com --- 83 == 70%
6 s0.2mdn.net
4 cp30559.edgefcs.net
4 pix04.revsci.net
2 admin.brightcove.com
2 b.scorecardresearch.com
2 odc.weather.com
2 secure-us.imrworldwide.com
2 speed.pointroll.com --- 107 == 90%
1 x 12
So, exponential/Zipf, not normal
90% of the requests are to 54% (14 out of 26) of the hosts
At least *.imwx.com and edgefcs (manages flash polling) are akamai
-------
Traffice to the top 14 hosts measured in bytes
n mean total s.d.
i.imwx.com 34 6271.62 213235 8354.51 *
s.imwx.com 14 8070.86 112992 6678.07 *
www.weather.com 12 8742.17 104906 13313.3 *
ad.doubleclick.net 9 498.556 4487 526.193
b.imwx.com 7 43 301 0
d.imwx.com 7 16518 115626 17250 *
s0.2mdn.net 6 4869.33 29216 5155.37
cp30559.edgefcs.net 4 72.5 290 81.0987
pix04.revsci.net 4 257.5 1030 193.736
admin.brightcove.com 2 12929 25858 5051.57
b.scorecardresearch.com 2 570 1140 806.102
odc.weather.com 2 21.5 43 30.4056
secure-us.imrworldwide. 2 93.5 187 54.4472
speed.pointroll.com 2 63357.5 126715 61188.1
12 more 1 4004.58 48055 6225.55
Total 119 6588.92 784081 12875
*ed lines say that 4 sites account for 56% of the requests and 70% of
the bytes
Number of requests and bytecount are roughly correlated (spearman rank
correlation .51, p<.01), with speed.pointroll.com being the obvious outlier)
--
Henry S. Thompson, School of Informatics, University of Edinburgh
10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
[mail from me _always_ has a .sig like this -- mail without it is forged spam]
Received on Wednesday, 13 June 2012 19:37:03 UTC