What it means to deliver exceptional performance

What it means to deliver exceptionalperformanceAlois Reitbauer, Technology Strategist, dynaTrace

What is exceptional performance?

It depends …

Websites should load in 2 to 4 seconds

Interactions shouldtake less than a second

What users say …

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

The 20 percent rule1.6 s 2s 2.4 s

Exceptionalperformance starts at 1.6 seconds

You might thinkthis is a lot of time

It is not under your control Your control ends here

Web Application Delivery Chain Content Internet ServerBrowser Processing 3rd Party

How much time do you really have?

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

Adding two round trips we are down to 1.3 seconds

We haven’t downloaded anything yet

200 kB at 1.5 Mb/stake about a second

After content download we have 0.3 seconds

Client side processing ~ 0.3 seconds

… we now have 0.0 seconds left …

… and have notconsidered server-side processing

Is it impossible to be exceptionally fast?

No, but it is really hard

How do we get there?

Do your homework #webperf

… many people don’t

How good are we?

Then we need to look at actual timings

What to look at?

Now, we need to benchmark

So now we are done?

We need to optimizeour site for all users

Real User Experience

And then …

… we have to do this continuously

Alois Reitbauer @AloisReitbaueralois.reitbauer@dynatrace.com http://blog.dynatrace.com

by Alois Reitbauer on Nov 08, 2011