1. What it means to deliver exceptional
performance
Alois Reitbauer, Technology Strategist, dynaTrace

2. What is exceptional
performance?

3. It depends …

4. Websites should
load in 2 to 4
seconds

5. Interactions should
take less than a
second

6. What users say …

7. People are not
clocks
(i.e. their time perception is not that precise)

8. The 20 percent rule
1.6 s 2s 2.4 s

9. Exceptional
performance starts at
1.6 seconds

10. You might think
this is a lot of time

11. It is not under your control
Your control ends here

12. Web Application Delivery Chain
Content
Internet
Server
Browser
Processing
3rd Party

13. How much time do
you really have?

14. Getting web content
Content
Icon: http://www.gettyicons.com/free-icon/112/hardware-icon-set/free-server-icon-png/

15. Adding two round trips
we are down to 1.3
seconds

16. We haven’t downloaded
anything yet

17. 200 kB at 1.5 Mb/s
take about a second

18. After content download
we have 0.3
seconds

19. Client side processing
~ 0.3 seconds

20. … we now have 0.0
seconds left …

21. … and have not
considered server-side
processing

22. Is it impossible to be
exceptionally fast?

23. No, but it is really hard

24. How do we get there?

25. Do your homework
#webperf

26. … many people don’t

27. How good are we?

28. Then we need to look at
actual timings

29. What to look at?

30. Now, we need to benchmark

31. So now we are done?

32. We need to optimize
our site for all users

33. Real User Experience

34. And then …

35. … we have to do this
continuously

36. Alois Reitbauer
@AloisReitbauer
alois.reitbauer@dynatrace.com
http://blog.dynatrace.com