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UnPerformantPress
The Problem With WordPress
!
peterwilson.cc • @pwcc
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Timed using WebPageTest - pwcc.cc/wcbne/400ms
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0.4
peterwilson.cc
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Timed using WebPageTest - pwcc.cc/wcbne/400ms
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Timed using WebPageTest - pwcc.cc/wcbne/400ms
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1.8
peterwilson.cc
Timed using WebPageTest - pwcc.cc/wcbne/400ms
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How To Get A Page
Speed Score In The 90s
Peter Wilson
!
peterwilson.cc • @pwcc
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pwcc.cc/wcbne/pagespeed
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pwcc.cc/wcbne/pagespeed
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Why PageSpeed?
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Fortherock (CC) - flic.kr/p/6Wyb2u
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Fortherock (CC) - flic.kr/p/6Wyb2u
• SSL
• Fast loading
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F Delventhal (CC) - flic.kr/p/gnLLPF
It’s the vibe
of the thing
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Ultimately, your visitors
HATE WAITING WITH A PASSION
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Today’s focus:
Code you can upload
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Visual progress
Via WebPageTest
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Try, Measure, Test
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WebPageTest - webpagetest.org
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WebPageTest - webpagetest.org
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Comparison timelines
No SSL vs SSL
Timed using WebPageTest - pwcc.cc/wcbne/thesslquestion
0.9s 1.0s 1.1s 1.2s
99% 99% 99% 99%
0% 0% 0% 99%
No SSL
SSL
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Comparison timelines
No SSL vs SSL
Timed using WebPageTest - pwcc.cc/wcbne/thesslquestion
0.9s 1.0s 1.1s 1.2s
99% 99% 99% 99%
0% 0% 0% 99%
No SSL
SSL
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Comparison timelines
No SSL vs SSL
Timed using WebPageTest - pwcc.cc/wcbne/thesslquestion
0.9s 1.0s 1.1s 1.2s
99% 99% 99% 99%
0% 0% 0% 99%
No SSL
SSL
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Comparison timelines
No SSL vs SSL
Timed using WebPageTest - pwcc.cc/wcbne/thesslquestion
0.9s 1.0s 1.1s 1.2s
99% 99% 99% 99%
0% 0% 0% 99%
No SSL
SSL
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Key metrics
Document Complete Fully Loaded
Load Time First Byte
Start
Render
Visually
Complete
Speed Index
DOM
Elements
Time Requests Bytes In Time Requests Bytes In
3.466s 0.835s 1.190s 3.300s 1221 356 3.466s 18 310 KB 3.614s 20
312
KB
WebPageTest - webpagetest.org
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SSL Waterfall
WebPageTest - webpagetest.org
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SSL Waterfall
WebPageTest - webpagetest.org
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WebPageTest - webpagetest.org
SSL Waterfall
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Measuring is useless
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Alisha Vargas (CC) - flic.kr/p/6onXW9
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Performance starts with design
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No content
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Let’s write some code
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We’ve made a plan.
Let’s carry it out.
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JavaScript in the footer
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All visitors have JavaScript
disabled while it downloads.
– Every progressive enhancement advocate ever
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wp_enqueue_script(.
..'pwcc0scripts',..//.handle.
..'/path/file.js',.//.source.
..null,............//.no.dependancies.
..'20150530031',...//.version.
..true.............//.load.in.footer.
);
JavaScript, the WordPress way
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wp_enqueue_script(.
..'pwcc0scripts',..//.handle.
..'/path/file.js',.//.source.
..null,............//.no.dependancies.
..'20150530031',...//.version.
..true.............//.load.in.footer.
);
!
!
!
!
!
!!true!!!!!!!!!!!!!//!load!in!footer!
JavaScript, the WordPress way
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wp_enqueue_script(.
..'pwcc0scripts',..//.handle.
..'/path/file.js',.//.source.
..array('jquery'),.//.yay,.jQuery.
..'20150530031',...//.version.
..true.............//.load.in.footer.
);
jQuery, the WordPress way
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wp_enqueue_script(.
..'pwcc0scripts',..//.handle.
..'/path/file.js',.//.source.
..array('jquery'),.//.yay,.jQuery.
..'20150530031',...//.version.
..true.............//.load.in.footer.
);
jQuery, the WordPress way
!
!
!
!!array('jquery'),!//!yay,!jQuery!magically!loads!
!
!
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.
.
!!!
!!!
...
...
jQuery, doing_it_wrong()
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The WordPress way blocks rendering
loading.io
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Blake Patterson (CC) - flic.kr/p/5EqV3b
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add_data(.'jquery0core',.'group',.1.);.
!
doing_it_wrong_and_loving_it()
add_data(.'jquery@core',.'group',.1.);.
!
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wp_enqueue_script(.
..'pwcc0scripts',..//.handle.
..'/path/file.js',.//.source.
!!array('jquery@core'),!//!only!jQuery,!no!jQuery@migrate!
..'20150530031',...//.version.
..true.............//.load.in.footer.
);
doing_it_wrong_and_loving_it()
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.
.
!!!
!!!
...
...
doing_it_wrong_and_loving_it()
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.
.
!
...
!!!
...
doing_it_wrong_and_loving_it()
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.
.
!
...
!!!
...
doing_it_wrong_and_loving_it()
pwcc.cc/wcbne/jqueryfooter
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Load all the things asynchronously
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Asynchronous JavaScript
.....
...
...
...
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function.pwcc_async_js(.$tag,.$handle.).{.
..switch.(.$handle.).{.
...case.'pwcc0scripts'.:.
....$tag.=.str_replace('>
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..switch.(.$handle.).{.
...case.'pwcc0scripts'.:.//.falls.through.
...case.'picturefill'..:.
...$tag.=.str_replace('>
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..switch.(.$handle.).{.
...case.'pwcc0scripts'.:.//.falls.through.
...case.'picturefill'..:.//.falls.through.
...case.'devicepx'.....:.
...$tag.=.str_replace('>
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function.pwcc_async_js(.$tag,.$handle.).{.
..switch.(.$handle.).{.
....….
..}.
..return.$tag;.
}.
!
add_filter(/'script_loader_tag',/'pwcc_async_js',/10,/2/);
Asynchronous JavaScript
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function.pwcc_async_to_header().{.
..global.$wp_scripts;.
..$wp_scripts0>add_data(.'picturefill',..'group',.0.);.
..$wp_scripts0>add_data(.'pwcc0scripts',.'group',.0.);.
..$wp_scripts0>add_data(.'devicepx',.....'group',.0.);.
}.
add_action('wp_enqueue_scripts','pwcc_async_to_header',99);
Asynchronous JS in the header
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function.pwcc_async_to_header().{.
..global.$wp_scripts;.
..$wp_scripts0>add_data(.'picturefill',..'group',.0.);.
..$wp_scripts0>add_data(.'pwcc0scripts',.'group',.0.);.
..$wp_scripts0>add_data(.'devicepx',.....'group',.0.);.
}.
add_action('wp_enqueue_scripts','pwcc_async_to_header',99);
Asynchronous JS in the header
pwcc.cc/wcbne/asyncjs
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Asynchronous CSS
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Yutaka Tsutano (CC) - flic.kr/p/8d4XxS • VIA Gallery (CC) - flic.kr/p/5QTEFc
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No content
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No content
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No content
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No content
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No content
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No content
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No content
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No content
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.
.
@0ms0viewport{width:device0width;zoom:1}@0o0viewport.
{width:device0width;zoom:1}@viewport{width:device0width;.
zoom:1}html{font0family:sans0serif;0ms0text0size0adjust:
100%;0webkit0text0size0adjust:100%}body{margin:0}article,.
aside,details,figcaption,figure,footer,header,hgroup,main,.
nav,section,summary{display:block}audio,canvas,progress,.
video{display:inline0block;vertical0align:baseline}
audio:not([controls]){display:none;height:0}[hidden],.
template{display:none}a{background:transparent}a:active,.
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No content
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pwcc.cc/wcbne/loadcss
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wp_register_style(.
..'pwcc0styles',........//.handle.
..'/style.min.css',.....//.file.
..null,.................//.dependencies.
.."20150530031".........//.version.
);.
CSS, the WordPress way
functions.php
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if.(.is_css_file_cached().).{.
.wp_enqueue_style(.'pwcc0styles'.);.
}.
!
!
!
CSS, the WordPress way
functions.php/(pseudo/code)
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if.(.is_css_file_cached().).{.
.wp_enqueue_style(.'pwcc0styles'.);.
}.
!
!
!
else.{.
.//.prepare.for.script.to.be.inlined.(file.is.not.cached).
.$inlineCss[].=."pwcc0styles";.
}
CSS, the WordPress way
functions.php/(pseudo/code)
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if.(.!.is_css_file_cached().).{.
..echo.'';.
..echo.$inlineCss;.
..echo.'';.
!
!
}
CSS, the WordPress way
header.php/(pseudo/code)
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Photos by Michaela (CC) - flic.kr/p/p9pbn8
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Curimedia (CC) - flic.kr/p/r6xPDP
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if.(.!is_css_file_cached().).{.
..echo.''...$inlineCss...'';.
..echo.'';.
..echo.'loadCss(."style.min.css".);';.
!
..echo.'';.
}
CSS, the WordPress way
header.php/(pseudo/code)
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if.(.!is_css_file_cached().).{.
..echo.''...$inlineCss...'';.
..echo.'';.
..echo.'loadCss(."style.min.css".);';.
!
..echo.'';.
}
CSS, the WordPress way
header.php/(pseudo/code)
if.(.!is_css_file_cached().).{.
..echo.''...$inlineCss...'';.
..echo.'';.
..echo.'loadCss(."style.min.css".);';.
..set_css_cached(.'pwcc0styles'.);.
..echo.'';.
}
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set_css_cached
functions.js
!
!
document.cookie.=.'csscached=20150530031;.path=/';.
!
!
!
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is_css_file_cached
functions.php
if.(.isset(.$_COOKIE["csscached"].).&&..
...(."20150530031".==.$_COOKIE["csscached"].).).{.
.return.true;.
}.
else.{.
.return.false;.
}
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.
.
@0ms0viewport{width:device0width;zoom:1}@0o0viewport.
{width:device0width;zoom:1}@viewport{width:device0width;.
zoom:1}html{font0family:sans0serif;0ms0text0size0adjust:
100%;0webkit0text0size0adjust:100%}body{margin:0}article,.
aside,details,figcaption,figure,footer,header,hgroup,main,.
nav,section,summary{display:block}audio,canvas,progress,.
video{display:inline0block;vertical0align:baseline}
audio:not([controls]){display:none;height:0}[hidden],.
template{display:none}a{background:transparent}a:active,.
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.
.
.
!
.
.
.
.
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.
.
.
!
.
.
.
.
pwcc.cc/wcbne/inlinecss
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Flash of unstyled text
meet your new best friend
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No content
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Visual progress
Via WebPageTest
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Visual progress
Via WebPageTest
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Invisisble
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No content
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No content
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No content
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Unstyled
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No content
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No content
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No content
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We could also use browser fonts.
Just occasionally.
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We could also use browser fonts.
Just occasionally.
We could also use browser fonts.
Just occasionally.
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Validate me on Social Media
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No content
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No content
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No content
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The Facebook like button:
56 bytes per pixel
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“That’s fooked, how the fook can it
take fifty-two-point-fooking-eight-
fooking-kilobytes to display a
fooking like button. A fooking like
button no one will ever fooking
press anyway!”
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Like us on Facebook
!
.
......
.....Like.us.on.Facebook.
.
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Like us with CSS
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Like us with CSS
pwcc.cc/wcbne/fbcss
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A mark a yen a buck or a pound
money makes the world go round
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alistapart.com
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zeldman.com
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daringfireball.net
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dribbble.com
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Download 15 free, beautiful,
high res photos for your next
project.
!
!
Ads by the Network
Ian Sane (CC) - flic.kr/p/dqLXek
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Bad advertising insert code
!
(function(id).{.
.document.write('');.
})(“AL");.
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Bad advertising insert code
!
(function(id).{.
.document.write('');.
})(“AL");.
!
!
.document.write.
!
!
!
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Bad advertising insert code
!
(function(id).{.
.document.write('');.
})(“AL");.
!
!
.................
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No content
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No content
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Slightly better ad code
!
...
...
!
...
.
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Slightly better ad code
!
...
...
.....
...
.
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All this and more.
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Performance tuning my site
increased my traffic
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Performance tuning my site
got me more Googles
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More to do
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Ignore best practice
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Thank you
Peter Wilson
!
peterwilson.cc • @pwcc