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How Website Speed Actually Impacts
Search Ranking
Mark Isham
CEO, Zoompf
Google Webmaster Blog
April 9, 2010
Announcements from SMX Advanced
June 11, 2013
• Document Complete?
• Visually Complete?
• Time to Render Start?

• Time to First Byte?
• Google Analytics?
• What’s “good enough”?
2000 Random :
• HDTV
• Durable power of
attorney
• Sporting goods stores
• …

X

Top 50 Results for Each:
• http://atg.sd.gov/Seniors/EstatePlanning
/PowerofAttorney.aspx
• https://en.wikipedia.org/wiki/Power_of
_attorney
• http://www.nolo.com/legalencyclopedia/durable-power-ofattorney-health-finances-29579.html
• …

=
100,000 Test Pages
Search Term

Rank

URL

HDTV

1

url1

HDTV

2

url2

…

50

…

Sporting Goods Stores

1

Sporting Goods Stores

2

…

50

http://zoompf.com/search-ranking-factors
url1

url1

5.1

…

url2

url2

3.2

…

…

…

2.5

…

30 “Private” WebpageTest Instances on EC2
Metrics Captured

•
•
•
•
•

Document Complete Time
Fully Loaded Time
Time to First Byte
Time to Fully Rendered
Bytes Downloaded

•
•
•
•
•

Requests Made
Total Image Size
Gzip Savings
Minify Amount
More…
What Does this Mean?
• TTFB is easiest to measure
• Top performers invest in infrastructure
• Data is correlative only!
– Relevancy remains king

Our Recommendation:
TTFB of 500 ms or less!
What About the Long Tail?
(Searches with 4 or more keywords)
What is Time to First Byte?

TTFB = Latency + Server Response Time
Measuring Latency

1. Use PING
2. Goal: 100 ms or less
Latency: Use a CDN

Akamai, Cloudfront, CloudFlare, …
Server Response Time
TTFB = Latency + Server Response Time
So…
Server Response Time = TTFB - LATENCY

Tips
• Use WebPageTest for TTFB
• Use PING for Latency
Goal

Get Under Here!
TTFB = Latency + Server Response Time
(TTFB) 500 ms = (Ping) 100 ms + (Server Time) 400 ms
Optimizing Server Components
•
•
•
•
•

Big Topic, out of scope
Fast Webservers
Responsive Databases
Optimized code
Use caching!
– (Expires or cache-control: max-age)
Other Interesting Data
(Average across all 100k results)
Metric

Value

Document Complete

8.5 s

Fully Rendered

12.0 s

Time to First Byte

874 ms

Page Size

1.42 MB

Server Requests

104

Total Image Size

492 kb
References
• Moz Study: http://moz.com/blog/how-website-speedactually-impacts-search-ranking
• Time to First Byte: http://moz.com/blog/improvingsearch-rank-by-optimizing-your-time-to-first-byte
• Study Data: http://zoompf.com/search-ranking-factors
• Zoompf Free Tool: http://zoompf.com/free
CONTACT INFO:
Mark Isham
mark@zoompf.com
Twitter: @Zoompf

plus.google.com/+Zoompf

http://zoompf.com

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The Impact of Website Speed on Search Ranking - 2013