Mobile Performance Testing consists of three parts: Part 1 - Client Application performance Part 2 - Server performance Part 3 - Network performance The slide deck we cover how to performance test the network as it applies to a mobile device. Learn: ■ Causes of network related problems ■ What tools and services are available ■ CDNs and other strategies to mitigate network cause problems

1. Mobile Performance Testing: Part 3: Testing the Network

2. Mobile Performance:
Part 3 – Testing the Network
Alan Trefzger
XBOSoft
Senior Quality Consultant

3. Agenda
• Introduction
– 2013 State of Mobile Testing Survey
• Testing the End-User experience
• Network Problems
• Solutions – What can we do?
– Case Study: Analyzing mobile websites across different
Networks. (and how to fix them)
– CDN: Content Delivery Network.
• Conclusion

4. Introduction

5. The Mobile Challenge
• Mobile Internet usage is projected to pass desktop Internet
usage in 2014
• Mobile traffic is doubling every year from 2009 onward and
continue until 2014
4,000,000
3,500,000
Mobile Traffic in
3,000,000 Terabytes per month
2,500,000
2,000,000
1,500,000
1,000,000
500,000
0
2009 2010 2011 2012 2013 2014

6. Mobile Performance
• 60% of mobile failures are performance, non functional issues.
• Google found that a .5-1 second increase in page load time
resulted in a 20% decrease in traffic and revenue
• Gold standard used to be 6 seconds, but now is 3 seconds
• We expect the online experience to be as fast as our desktop
experience, but it isn’t, and that is a problem.
• Mobile is slower, but it doesn’t have to be.

7. 2013 State of Mobile Testing
Survey by XBOSoft
• Ratio of developers to testers: 2 to 1
• Plans for 2013 will decrease testers relative to developers.
• Only 41% do performance testing
• 60% don’t consider the network when testing.
• 64% don’t test in other countries where the network
characteristics will be a lot different.
• 62% have dedicated mobile QA teams
Download the full report at
http://www.xbosoft.com/contact/research/mobile-testing-report-2013

8. Mobile Performance Testing
Part 1: Testing the Device
• Tested a high price, mid-priced and cheap phone.
• ‘Angry Birds’ app was used for the test.
• Used the tool Quadrant to compare.
Part 2: Testing the Server
• Used Webpagetest to analyze performance on a mobile device.
• Looked at ways to speed up performance.
Part 3: Testing the Network
• Used Shunra’s Mobile Performance Report to test and compare.

9. If your not considering the network
before you start developing,
you are setting yourself up for
failure.

10. Testing the End-User
Experience

11. Testing Goal
• Test your application as the end-user
experiences it.
• End-to-End Testing: Testing the entire product.

12. Testing the End-User Experience
App Website
Server
Internet
• Functional, security, usability testing, etc.
• 59% stop here and declare ‘success’

13. Service Virtualization
App Website
Server
Internet
• Functional, security, usability testing, OS
Phones Tablets etc.
• 59% stop here and declare ‘success’20+
Android 3,000+ 100+
Apple 5 3 15
Testing actual
devices

14. Service Virtualization
DB / mainframe
App Website
Under
Server
construction
Internet
Service Virtualization – Intelligent Stubbing
• May not be able to access company DB / MF
• Parts of the product may not be finished
Testing actual
devices

15. Service Virtualization
3rd party DB / mainframe
App Website
Under
Server
construction
Internet
Composite Application
• Access 3rd party web services
• May cost to access
• They don’t want you stress testing their service
Testing actual
devices

16. Service Virtualization
Testing 1,000 3rd party DB / mainframe
virtual users
App Website
Under
Server
construction
Internet
Service Virtualization
• Need to stress test 100 – 10,000 users
• Transport-level emulation of many users
• GUI emulation
Testing actual
devices

17. Network Virtualization
Testing 1,000 3rd party DB / mainframe
virtual users
App Website
Network Under
Server
construction
Internet
Network Virtualization
• Hardest to emulate
• Most performance problems caused by network
Testing actual
devices

18. What connection do you have?
3G
Wi-Fi
2.5G
Internet
4G
Website
Server
Network varies widely, very unpredictable

19. Problems of
Mobile Networks
(that Broadband doesn’t have)

20. Problems of Networks
• Uncertainty – don’t know ahead of time what network you
will be connected to.
• Uncertainty – don’t know ahead of time what the quality of
network will be.
• Very hard to repeat network conditions for testing because
everything is constantly changing.
• Global differences in network speeds and reliability.
• Customers don’t care where the problem is. You will get
blamed for poor performance even if it is the network.

21. Problems of Networks
Can’t fine tune it later or solve it later.
• Can’t upgrade bandwidth.
• Can’t upgrade hw in mobile device.
• Can’t put in an accelerator.
• Can’t do many of the things that you could if it was a PC.
The mobile Network is just shining a light on
pre-existing problems.

22. Slow network speeds
• Long, Slow TCP connections
• Slower network speeds means strategies that worked for
desktop/broadband connection, will not work for mobile.
e.g. Serial connections can take very long time with a slow
network.
• TCP Time-outs
– Increasing TCP timers is NOT the answer.
– Changing the timers can be high risk and cause unexpected timing
problems.
– Can cause application timers to timeout.
– Whenever you see TCP timeouts, you will have significant
performance degradation.

23. Latency
Latency - time it takes to go end-to-
Internet end (or round trip).
Latency is 2-10 times longer than
broadband.
Jitter – latency variation over time.
Jitter can vary, be very large and
will cause disconnects.
• A change in latency from 2ms
(broadband) to 400ms (3G
network) can cause a page load
to go from 1 second to 30
seconds

24. Connection Disruption
• Sometimes when you are traveling and your cell phone
connection is being passed from one cell tower to another, a
disruption can be caused.
• Almost no packet loss for broadband, but a truck going
passing between you and the cell tower can cause packet loss
and re-transmission.
• Some think that bandwidth is the problem, but many times it
is NOT, it is a latency problem.
• Packet drops with retransmissions will be common.

25. Global Network Issues
• Testing the same phones in USA, India, and China.
– Phones, browsers, and websites that worked fine in the
USA didn’t work in India.
• Data charged is a big factor in the emerging markets.
– What network providers’ charge is not necessarily based
on the size of the download.
– Amount customer was charged can vary greatly depending
on the browser or phone.
• Speed can vary greatly depending on
phone, browser, or network

26. Solution
What Can We Do?

27. What can we do?
Many say, “How can we change our customers perception? so
we don’t get blamed.”
Can’t do, we must change our reality.
• Developing for mobile is different than desktop.
• Developing for performance from the beginning.
• Just because we haven’t experienced a big failure yet, doesn’t
mean won’t and soon.

28. Plan ahead
• Critical that you carefully plan a mobile service deployment.
• The network can make a problem an order of magnitude
worse.
• What if your mobile service goes viral and your infrastructure
can not support it, then all you have done is caused a large
number of potential customers never to consider you again.
• Use Service Virtualization to test your mobile service.

29. Service Virtualization
Emulating services that are hard to replicate during testing
• The Network
• Third party composites
• Actual in-use internal database
• Parts of application that are under construction
• 10,000 users
Not just a stub, but emulates what is happening or what data is
coming back
Service Virtualization = Intelligent Stubbing
Allows Test early / Test often

30. Network Virtualization
Testing 1,000 3rd party DB / mainframe
virtual users
App Website
Network Under
Server
construction
Internet
Network Virtualization
• Most performance problems caused by network.
• Hardest to emulate – must use a tool
Testing actual
devices

31. Tools
• Network Link Conditioner - Apple in its developer kit for
iOS6, good place to start
– Simulate internet connection and bandwidth speeds
– Simulate a 3G, DSL, Edge, very bad connection, etc…
• Network Catcher – Shunra
– can capture network profile and environment from almost anywhere
in the world.
– Gives details on why the problems happened.
– Global library of networks from all over the world.

32. Tools
• vCat – Shunra
– emulates a network profile
– LoadRunner is user virtualization a
– LR is closely integrated with vCat
– LR controls the entire test, including vCat,
– Very repeatable
– What if scenarios
• Perfecto Mobile
• Device Anywhere

33. Live vs. Emulated Network
• Live, real Network
– Cannot duplicate conditions
– Too many variables
– Actual conditions won’t be consistent
• Emulated Network
– Repeatable
– Can vary conditions
– What if scenarios

34. Network Virtualization
Shunra offers a free service using their NetworkCatcher
and vCat products to analyze mobile applications on
the various networks.
Mobile Application Performance Report
• Analysis of your mobile application on various networks.
• Recommendations on how to improve your mobile
application.

35. Performance on Different Networks

36. Network Characteristics
WiFi 4G fair 3G good 3G 2.5G

37. Component and Waterfall
Waterfall Components
Number of Requests by
component type

38. Performance Score
• Bollywoodhungama.com received a very low score of 54/100.
Example:
8 of the 25
areas where
performance
improvement
can be
made.

39. What else can be done? CDNs
CDN – Content Delivery Networks
Goal: To serve content to end users with cheapest cost or
highest performance. Optimal situation is when these two
goals are aligned.
• This is achieved by optimizing delivery across local networks
• Instead of accessing data from a central server, the CDN
parses out the requests to the nearest server.

40. CDN – Content Delivery Networks
The Problem: Data delivery can be slow depending on several
factors
1. Request Location
2. Current server load
3. Network Load
London
Example: Service to Wash DC
a client in Wash DC
can be a lot faster
than service to Internet
service to a client in
London
Dulles VA
Website
Server

41. CDN – Content Delivery Networks
The Solution:
• High Speed replication of content
• Server load balancing
• Service request routing
• Web Caching London
Wash DC
Example: Service to
a client in Wash DC Internet
can be as fast as
service to a client in
London Dulles VA
Website
Server

42. Improvements to Watch For
Better integration of CDNs to Mobile
Traffic Optimization: Wireless operators are managing
content to provide a better overall mobile
experience.
• Fast dormancy
• Bigger pipes
• Offloading to other networks
• Optimizing traffic

43. Characteristics of a Good mobile
app/m.site
• Worrying about the end user experience ahead of
deployment.
• Proactive engineering
• Fault tolerant
• 3 second response
• Can handle spikes in load
• Performance standards are specified in advance.
• Topology of my servers is planned and understood.

44. Issues to consider at beginning,
but especially before deployment
• Set performance service standards, e.g. 3 seconds response
• What if your service goes viral.
• Is it internal or external.
• Paid/not paid.
• Capacity planning.
• Revenue generating.
• Is your logo on it? Bad performance will hurt your brand.

45. Optimization Strategies
(Covered in Part 2: Server Performance Testing)
1. Reducing the number of HTTP Requests
– Consolidating Resources
– Embed resources in html for first-time use
– HTML5 Web Storage
– Uni-directional server updates
2. Reduce Payloads:
– Compress
– Resize
– Simplify

46. Conclusion
Moore’s Law for computer power and storage
Nielsen’s Law for Internet bandwidth
Long term looks good, but in the mean time.
• Test early, test often.
• Best way to solve mobile performance problems is
to prevent them. Don’t wait until after deployment
to start worrying about performance issues.
• No network performance testing will lead to
disaster!

47. Q&A
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