なぜ、ページ読み込み速度改善に投資しなければならないのか。

1. The performance business pitch / Stoyan's phpied.com

2. Bing.com
0
-1.00
Percent change
-2.00
-3.00
-4.00
-5.00
50 200 500 1000 2000
Added delay
Queries per Visitor Query refinement Source: Microsoft Bing data from Velocity’09
Revenue per visitor Any clicks
Satisfaction

3. Google
Slowing down search
• Search/user decrease by 0.44%
• Dropped to 0.74% after six weeks
• User did 0.21% fewer searches, even after
we stopped injecting the delay
•
•

4. Yahoo!

5. AOL
Average Page Views per Visit
9
8
7
6
6
5
4
3
2
10th 20th 30th 40th 50th 60th 70th 80th 90th 100th
Visit Load Time Percentile*
*10th is fastest 10% of the visit sample, 100th is slowest 10%

6. Shopzilla
Performance Summary
• Conversion Rate +7% - 12%
• Page View’s +25%
• US SEM Sessions +8%
• Bizrate.co.uk SEM Sessions +120%
• Infrastructure Required (US) -50% (202 vs 402 nodes)
• Availability 99.71% → 99.94%
• Product Velocity +225%
• Release Cost $1,000’s → $80

7. Shopzilla
•
•

8. Netflix

12. 10% 90%

13. 38% 62%

15. Thanks!

16. URLs
Google, Bing: h-p://en.oreilly.com/velocity2009/public/schedule/detail/8523
Shopzilla: h-p://en.oreilly.com/velocity2009/public/schedule/detail/7709
NeFlix: h-p://en.oreilly.com/velocity2008/public/schedule/detail/3632
AOL: h-p://en.oreilly.com/velocity2009/public/schedule/detail/7579
Yahoo!: h-p://www.slideshare.net/stoyan/yslow‐20‐presentaPon
Bing graphic: h-p://www.watchingwebsites.com/..improves‐online‐business
Steve Souders: h-p://stevesouders.com
Stoyan Stefanov: h-p://phpied.com
Sponsored search and speed: h-p://adwords....answer.py?hl=en&answer=87144

17. Credits
h-p://www.flickr.com/photos/erokcom/2255972175/
h-p://www.flickr.com/photos/erokcom/2255977349/
h-p://www.flickr.com/photos/erokcom/2256780178/
h-p://www.flickr.com/photos/erokcom/2253521650/
h-p://www.flickr.com/photos/irfan9727/3555580389/