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Hands on Web Performance Workshop
Andy Davies@andydavies
Tobias Baldauf@tbaldauf
#VelocityConf London 2013
We’re planning to cover
● Tools● Techniques● Live Analysis
But…
…this session is about
YOUso feel free to jump in with questions
What sites should we test?
http://man.gl/londonworkshop
Do you use WebPageTest?
PhantomJS http://github.com/ariya/phantomjs/
Phantomas
{ "url":"http://tobias.is", "metrics":{
"requests":11,"gzipRequests":2,"postRequests":0,"redirects":0,"notFound":0,"timeToFirstByte":107,"timeToLastByte":120,"bodySize":151897,"contentLength":206417,
[...]
http://github.com/macbre/phantomas
All together now!#!/usr/bin/env bashURL_to_measure="$1"
Metrics_to_analyze=('timeToFirstByte' 'requests' 'cssSize')
Phantomas_JSON_output=$(phantomas --format=json --url "${URL_to_measure}")
for((i=0;i<${#Metrics_to_analyze[@]};i++)) ; do eval ${Metrics_to_analyze[$i]}=$(echo "$Phantomas_JSON_output" | jq ".metrics."${Metrics_to_analyze[$i]}) export ${Metrics_to_analyze[$i]}done
bats --tap performance-tests.bats
#!/usr/bin/env bats
@test "Time to first byte" { [ "$timeToFirstByte" -lt 200 ]}
@test "Number of HTTP requests" { [ "$requests" -lt 30 ]}
@test "CSS size" { [ "$cssSize" -lt 15360 ]}
#1..3ok 1 Time to first byteok 2 Number of HTTP requestsnot ok 3 CSS size# (in test file /test/webperf/performance-tests.bats, line 23)
http://github.com/technopagan/simple-website-speed-test
WebPagetest API
http://github.com/marcelduran/webpagetest-api
Run WPT Run!webpagetest test http://velocityconf.com --server wpt.yourdomain.tld --location Local-SGS2 --wait
{ "statusCode": 200, "statusText": "Ok", "data": {
"testId": "131019_VF_1","ownerKey": "b5cf1cb86be59d94f3ee714f15da3efe5cf05b7z","jsonUrl": "http://wpt.yourdomain.tld/jsonResult.php?test=131019_VF_1","xmlUrl": "http://wpt.yourdomain.tld/xmlResult.php?test=131019_VF_1","userUrl": "http://wpt.yourdomain.tld/results.php?test=131019_VF_1","summaryCSV": "http://wpt.yourdomain.tld/csv.php?test=131019_VF_1","detailCSV": "http://wpt.yourdomain.tld/csv.php?test=131019_VF_1&req=1"
}
SwissArmyKnife Results"response": {
"statusCode": 200,"statusText": "Ok","data": {
"testId": "131019_VF_1", "summary": "http://wpt.yourdomain.tld/results.php?test=131019_VF_1", "from": "Samsung Galaxy SII - Native", "runs": 1, "successfulFVRuns": 1, "successfulRVRuns": 1, "average": { "firstView": { "loadTime": 6285, "TTFB": 2852, [...]
TAP & Jenkins Integration
What if we want to test more
than one page?
./sitespeed.io -u http://news.bbc.co.uk
Setup your own HTTP Archive…
Barbara Bermes - http://man.gl/1eHoyqB
Lots of data!
hist(results$reqTotal, xlim=c(0,200), ylim=c(0,375),breaks=seq(0,200,by=5), main="", xlab="Number of Requests",col="steelblue", border="white", axes=FALSE)
axis(1, at = seq(0, 225, by = 25))axis(2, at = seq(0, 400, by = 25))
library(RMySQL)drv = dbDriver('MySQL')con = dbConnect(drv, user='user', password='password', dbname='dbname', host='127.0.0.1')
results = dbGetQuery(con,statement='select * from pages;')
Import data into R
Plot histogram of requests / page
Sometimes bi-modal distributions
Commercial tools available too…
Let’s look at some live sites
Performance isn’t just about load time
http://www.flickr.com/photos/jaxport/8554780980
Painting every 20ms!
Logo is actually made of four images that fade from one to another.
CPU load varies between 7 - 20%
Has detrimental impact on mobile battery life
A Tale of CSS Checkbox Hacks<input type="checkbox" id="toggle" /><label for="toggle" class="toggle" onclick></label><ul class="menu"> <li><a href="#">Sictransit</a></li> <li><a href="#">Gloriamundi</a></li> </ul>
#toggle:checked ~ .menu {display: block;
}
http://css-tricks.com/the-checkbox-hack/
http://thenittygritty.co/toggle-navigation-with-pure-css
http://bugs.webkit.org/show_bug.cgi?id=45168
body { -webkit-animation: bugfix infinite 1s; /* here be dragons */}@-webkit-keyframes bugfix { from { white-space: default; } to { white-space: normal; }}
Be neighborlyAdjacent sibling selector trumps general sibling selector
<input type="checkbox" id="toggle" /><nav>
<label for="toggle" class="toggle" onclick></label><ul class="menu">
<li><a href="#">Sictransit</a></li> <li><a href="#">Gloriamundi</a></li>
</ul></nav>
#toggle:checked + nav .menu { display: block;}
Lessons learnedWorking in web performance is as much about educating as optimizing.
Choose your battles
http://josefbrandenburg.com
http://sapdesignguild.org
Thank You (we’re around all week)
Office Hours: 12:30 Thursday
Andy: @[email protected]
Tobias: @[email protected]