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NEED FOR SPEED
Realizzare siti velocissimi che caricano in
meno di 1 secondo
Andrea Cardinali
@andreacardinali
November 18th 2017
#wcmil @andreacardinali November 18th 2017
ANDREA CARDINALI
• DEVELOPER & SEO @ T.C. INFORMATICA
• LAVORO CON WP DAL 2009
• CO-ORGANIZZATORE DEL WP ROMAGNA
MEETUP
2
#wcmil @andreacardinali November 18th 2017
DI COSA PARLERÓ
• PERCHÉ è importante la velocità
• COSA significa VELOCE
• COSA rende veloce un sito
• COME rendere veloce un sito
3
#wcmil @andreacardinali November 18th 2017
BE SOCIAL
#WCMIL
@andreacardinali
4
#wcmil @andreacardinali November 18th 2017
LA VELOCITÁ È
IMPORTANTE?
5
#wcmil @andreacardinali November 18th 2017
PERCHÉ LA
VELOCITÁ È
IMPORTANTE
6
#wcmil @andreacardinali November 18th 2017
7
SITI SEMPRE PIÙ
PESANTI
#wcmil @andreacardinali November 18th 2017
SITI SEMPRE PIÙ PESANTI
8
OTTOBRE 2017OTTOBRE 2016
2585 kB 3575 kB
#wcmil @andreacardinali November 18th 2017
SITI SEMPRE PIÙ PESANTI
9
OTTOBRE 2017OTTOBRE 2016
2585 kB 3575 kB
+990 kB in 12 mesi
Fonte: http://httparchive.org
#wcmil @andreacardinali November 18th 2017
10
UTENTI SEMPRE
PIÚ
MOBILE
#wcmil @andreacardinali November 18th 2017
BASSA VELOCITÀ
CONNESSIONE
11
#wcmil @andreacardinali November 18th 2017
COPERTURA
3G/4G
NON OTTIMALE
12
#wcmil @andreacardinali November 18th 2017
13
INSODDISFAZIONE
#wcmil @andreacardinali November 18th 2017
LA VELOCITÁ
IMPATTA SULLA
USER EXPERIENCE
14
#wcmil @andreacardinali November 18th 2017
BASSA VELOCITÁ
AUMENTA LA
FREQUENZA DI
RIMBALZO
15
#wcmil @andreacardinali November 18th 2017
LA VELOCITÀ
IMPATTA SUL
TASSO DI
CONVERSIONE
16
#wcmil @andreacardinali November 18th 2017
LA VELOCITÀ
IMPATTA SULLE
VISUALIZZAZIONI DI
PAGINA
17
#wcmil @andreacardinali November 18th 2017
> BOUNCE RATE
< CONVERSION RATE
< PAGEVIEWS
=
< PROFITTI
18
#wcmil @andreacardinali November 18th 2017
+1 SEC = -7%
19
http://www.aberdeen.com/research/5136/ra-performance-web-application/content.aspx
#wcmil @andreacardinali November 18th 2017
“64% OF
SHOPPERS WHO
ARE UNHAPPY
WITH THEIR SITE
VISIT WILL GO
ELSEWHERE TO
SHOP NEXT TIME”
20
https://cdnify.com/blog/15-web-performance-stats/
#wcmil @andreacardinali November 18th 2017
“73% OF MOBILE
USERS SAID
THEY’VE
ENCOUNTERED A
SITE THAT WAS
“TOO SLOW TO
LOAD”
21
https://cdnify.com/blog/15-web-performance-stats/
#wcmil @andreacardinali November 18th 2017
“IF AMAZON
INCREASED
PAGE LOAD TIME
BY +100MS THEY
LOSE 1% OF
SALES”
22
https://cdnify.com/blog/15-web-performance-stats/
#wcmil @andreacardinali November 18th 2017
“IF GOOGLE
INCREASED
PAGE LOAD BY
+500 MS THEY
GET 25% FEWER
SEARCHES”
23
https://cdnify.com/blog/15-web-performance-stats/
#wcmil @andreacardinali November 18th 2017
“50% OF PEOPLE
WILL TELL OTHERS
IF THEY HAVE A
NEGATIVE
EXPERIENCE ON
YOUR SITE”
24
https://cdnify.com/blog/15-web-performance-stats/
#wcmil @andreacardinali November 18th 2017
MIGLIOR
USER EXPERIENCE
=
MAGGIORI
PROFITTI
25
#wcmil @andreacardinali November 18th 2017
26
#wcmil @andreacardinali November 18th 2017
IL TEMPO
(CHE FAI PERDERE AI
TUOI UTENTI)
È DENARO
(CHE PERDI TU)
27
#wcmil @andreacardinali November 18th 2017
LA VELOCITÀ
MIGLIORA IL
POSIZIONAMENTO
(SEO)?
28
#wcmil @andreacardinali November 18th 2017
NI
29
#wcmil @andreacardinali November 18th 2017
UN SITO VELOCE
NON MIGLIORA
DIRETTAMENTE IL
POSIZIONAMENTO
30
#wcmil @andreacardinali November 18th 2017
UN SITO LENTO
PEGGIORA
L’INDICIZZAZIONE
31
#wcmil @andreacardinali November 18th 2017
UN SITO LENTO
PEGGIORA IL
POSIZIONAMENTO
32
#wcmil @andreacardinali November 18th 2017
“SLOW SITES RANK WORST. IF YOU
RUN A FAST SITE, THAT’S GREAT
FOR YOUR USERS, GREAT FOR ROI,
FANTASTIC, YOU SHOULD PAY LOT
OF ATTENTION TO CACHE AND ALL
THIS SORT OF STUFF BUT YOU DON’T
GET A BOOST FOR IT. IT’S THE SITES
THAT ARE OUTLIERS IN TERMS OF
BEING REALLY SLOW THAT RANK
LOWER.”
33
Matt Cutts @ SMX 2013
#wcmil @andreacardinali November 18th 2017
CRAWL BUDGET
34
#wcmil @andreacardinali November 18th 2017
IL CRAWL BUDGET
È IL TEMPO CHE LO
SPIDER DEDICA
ALLA SCANSIONE
DEL SITO
35
#wcmil @andreacardinali November 18th 2017
TEMPO LIMITATO
36
#wcmil @andreacardinali November 18th 2017
SITO VELOCE =
SCANSIONE PIÙ
APPROFONDITA
37
#wcmil @andreacardinali November 18th 2017
SITO VELOCE =
MIGLIORE
INDICIZZAZIONE
38
#wcmil @andreacardinali November 18th 2017
MIGLIORE
INDICIZZAZIONE =
MIGLIOR
POSIZIONAMENTO
39
#wcmil @andreacardinali November 18th 2017
COSA SIGNIFICA
VELOCE?
40
#wcmil @andreacardinali November 18th 2017
LA RISPOSTA È
NELLA
PSICOLOGIA
UMANA…
41
#wcmil @andreacardinali November 18th 2017
MEMORIA A
BREVE TERMINE
LIMITATA
42
#wcmil @andreacardinali November 18th 2017
43
#wcmil @andreacardinali November 18th 2017
VOGLIAMO
AVERE IL
CONTROLLO
DELLA
SITUAZIONE
44
#wcmil @andreacardinali November 18th 2017
45
#wcmil @andreacardinali November 18th 2017
VOGLIAMO
EVITARE LE
ATTESE
46
#wcmil @andreacardinali November 18th 2017
47
#wcmil @andreacardinali November 18th 2017
SEMPRE PIÙ
DISTRATTI
48
#wcmil @andreacardinali November 18th 2017
QUANTO POSSIAMO
ASPETTARE?
Ritardo Reazione utente
0 - 100ms Istantanea
100 - 300 ms Ritardo appena percepibile
300 - 1000 ms FOCUS, Ritardo percepibile
1 secondo o più FLUSSO PENSIERI INTERROTTO
Cambio contesto mentale
10 secondi o più FRUSTRAZIONE e
ABBANDONO del SITO
49
[Miller 1968; Card et al. 1991] - Jakob Nielsen
#wcmil @andreacardinali November 18th 2017
SITO VELOCE =
1 SECONDO
50
#wcmil @andreacardinali November 18th 2017
COSA RENDE
VELOCE UN SITO
51
#wcmil @andreacardinali November 18th 2017
BACKEND
O
FRONTEND?
52
#wcmil @andreacardinali November 18th 2017
<20 %
BACKEND
53
#wcmil @andreacardinali November 18th 2017
>80 %
FRONTEND
54
#wcmil @andreacardinali November 18th 2017
55
BACKEND
FRONTEND
#wcmil @andreacardinali November 18th 2017
OTTIMIZZARE IL
BACKEND È INUTILE?
56
#wcmil @andreacardinali November 18th 2017
IL 20%
CONTROLLA
L’80%
57
#wcmil @andreacardinali November 18th 2017
LE
PERFORMANCE
PARTONO DAL
CODICE
58
#wcmil @andreacardinali November 18th 2017
I PLUGIN DI W.P.O.
NON SONO LA
SOLUZIONE
59
#wcmil @andreacardinali November 18th 2017
COME RENDERE
VELOCE UN SITO
60
#wcmil @andreacardinali November 18th 2017
LA TECNICA
SEGRETA #1 PER
RENDERE
VELOCE UN SITO
61
#wcmil @andreacardinali November 18th 2017
IL SEGRETO PER RENDERE
VELOCE UN SITO
62
#wcmil @andreacardinali November 18th 2017
SITO VELOCE 
PAGE BUILDER
63
#wcmil @andreacardinali November 18th 2017
COME CAPIRE SE
IL SITO È
VELOCE
64
#wcmil @andreacardinali November 18th 2017
"
"
CIÒ CHE NON È MISURABILE
NON È MIGLIORABILE
65
Galileo Galilei
#wcmil @andreacardinali November 18th 2017
STRUMENTI
• https://gtmetrix.com/
• https://www.webpagetest.org/
• https://tools.pingdom.com/
66
#wcmil @andreacardinali November 18th 2017
METRICHE
67
#wcmil @andreacardinali November 18th 2017
GOOGLE PAGE
SPEED SCORE
68
#wcmil @andreacardinali November 18th 2017
CHI È IL MIGLIORE?
69
SITO 1
SITO 2
#wcmil @andreacardinali November 18th 2017
E ADESSO?
70
SITO 1
SITO 2
#wcmil @andreacardinali November 18th 2017
CHI È IL MIGLIORE?
71
SITO 1
SITO 2
#wcmil @andreacardinali November 18th 2017
72
#wcmil @andreacardinali November 18th 2017
PAGE SPEED =
VANITY METRIC
73
#wcmil @andreacardinali November 18th 2017
4 METRICHE
74
#wcmil @andreacardinali November 18th 2017
#1
TIME TO FIRST
BYTE
(TTFB)
75
#wcmil @andreacardinali November 18th 2017
#2
KILOBYTES
76
#wcmil @andreacardinali November 18th 2017
#3
N° CONNESSIONI
HTTP
77
#wcmil @andreacardinali November 18th 2017
#4
ONLOAD TIME
78
#wcmil @andreacardinali November 18th 2017
TIME TO FIRST
BYTE
79
#wcmil @andreacardinali November 18th 2017
TTFB
80
#wcmil @andreacardinali November 18th 2017
VELOCIZZARE LA
RESTITUZIONE
DEL CODICE
HTML
81
#wcmil @andreacardinali November 18th 2017
82
#wcmil @andreacardinali November 18th 2017
RIDURRE TTFB
• Hosting performante
• PHP 7 (+ 300% web performance)
• Server side cache (Nginx / Varnish)
83
#wcmil @andreacardinali November 18th 2017
RIDURRE IL
PESO DELLA
PAGINA
84
#wcmil @andreacardinali November 18th 2017
RIDURRE IL PESO DELLA
PAGINA
•Abilitare compressione GZIP
•Minify risorse testuali (css, js,
html)
•Compressione immagini
•Intestazioni http scadenza
(Expire headers)
85
#wcmil @andreacardinali November 18th 2017
RIDURRE IL
NUMERO DI
CONNESSIONI
HTTP
86
#wcmil @andreacardinali November 18th 2017
1 RISORSA = 1
CONNESSIONE
HTTP
(HTTP/1.X)
87
#wcmil @andreacardinali November 18th 2017
1 RISORSA = 1 CONNESSIONE
88
#wcmil @andreacardinali November 18th 2017
N° MAX
CONNESSIONI
PER HOST
(HTTP/1.X)
89
#wcmil @andreacardinali November 18th 2017
RIDURRE IL NUMERO DI
CONNESSIONI HTTP
• Caricamento condizionale (Conditional
loading)
• Combine delle risorse (da valutare)
• HTTP/2
90
#wcmil @andreacardinali November 18th 2017
CARICAMENTO
CONDIZIONALE
add_action(‘wp_enqueue_scripts’,’crd_registra_js’);
function crd_registra_js()
{
$path=get_template_directory_uri().'/assets/js/’;
wp_register_script(‘myscript’,‘script.min.js’);
if(is_page())
{
wp_enqueue_script(‘myscript’);
}
}
91
#wcmil @andreacardinali November 18th 2017
HTTP/2
92
#wcmil @andreacardinali November 18th 2017
HTTP/2
• Supportato dall’85% dei browser in Italia*
• Migliora notevolmente le performance
• Elimina le limitazioni di HTTP/1.1
• Utilizza una sola connessione per host
• Scarica le risorse in parallelo
• Le risorse si possono prioritizzare (server
push)
• Richiede https
93
https://caniuse.com/#search=HTTP%2F2
#wcmil @andreacardinali November 18th 2017
DOWNLOAD CON HTTP
94
#wcmil @andreacardinali November 18th 2017
DOWNLOAD CON HTTP/2
95
#wcmil @andreacardinali November 18th 2017
HTTP VS HTTP/2
96
http://www.httpvshttps.com/
#wcmil @andreacardinali November 18th 2017
HTTP/2 - DA SAPERE
• I social counter vengono resettati
• Impostare i redirect nel .htaccess
• Attenzione ai mixed content
• Impostare il <meta name=«referer»>
adeguatamente
97
https://www.w3.org/TR/referrer-policy/#referrer-policies
#wcmil @andreacardinali November 18th 2017
ONLOAD TIME
98
#wcmil @andreacardinali November 18th 2017
ONLOAD TIME
99
#wcmil @andreacardinali November 18th 2017
AUMENTARE LA
VELOCITÀ
PERCEPITA
100
#wcmil @andreacardinali November 18th 2017
"
"
TIME IS MEASURED
OBJECTIVELY BUT PERCEIVED
SUBJECTIVELY, AND
EXPERIENCES CAN BE
ENGINEERED TO IMPROVE
PERCEIVED PERFORMANCE
101
Ilya Gregorik
#wcmil @andreacardinali November 18th 2017
PRIORITÀ AI
CONTENUTI
ABOVE THE
FOLD
102
#wcmil @andreacardinali November 18th 2017
PRIORITÀ AI CONTENUTI
ABOVE THE FOLD
103
#wcmil @andreacardinali November 18th 2017
CRITICAL
RENDER PATH
104
#wcmil @andreacardinali November 18th 2017
CRITICAL RENDER
PATH È COSTITUITO
DAL CODICE E DALLE
RISORSE
NECESSARIE A
VISUALIZZARE IL
CONTENUTO ABOVE
THE FOLD
105
#wcmil @andreacardinali November 18th 2017
https://it.wordpress.org/plugins/above-the-fold-optimization/
#wcmil @andreacardinali November 18th 2017
SERVER PUSH
107
#wcmil @andreacardinali November 18th 2017
SERVER PUSH
• La priorità dei contenuti è stabilita dal
server
• Le risorse con priorità più alta sono
scaricate per prime (indipendentemente
dalla loro posizione nel html)
108
#wcmil @andreacardinali November 18th 2017
SERVER PUSH
<?php
header("Link: </css/vendor.css>; rel=preload; as=style",
false);
header("Link: </css/styles.css>; rel=preload; as=style",
false);
header("Link: </images/site/logo--red.svg>; rel=preload;
as=image", false);
?>
109
https://it.wordpress.org/plugins/http2-server-push/
https://support.cloudflare.com/hc/en-us/articles/115002816808-How-do-I-enable-HTTP-2-Server-Push-in-WordPress
#wcmil @andreacardinali November 18th 2017
TUTTO QUI?
110
#wcmil @andreacardinali November 18th 2017
ASSOLUTAMENTE NO…
• Lazy load immagini, video
• Font loader
• Script asincroni e differiti
• DNS lookup
• preload, prefetch, prerender
• CDN
• Cache per utenti loggati
• […]
111
#wcmil @andreacardinali November 18th 2017
RICAPITOLANDO
• Il tempo è denaro
• Le performance partono dal codice
• Page Speed è una vanity metric
• La velocità è una percezione
• Page builder è sinonimo di lentezza
112
#wcmil @andreacardinali November 18th 2017
RICAPITOLANDO
• Concentratevi sul 20% che permette di
ottenere l’80% dei risultati
• PHP 7 / GZIP/ HTTP/2 / Cache
• Priorità ai contenuti above the fold
• Se non lo vedo, non lo carico (lazy load)
113
#wcmil @andreacardinali November 18th 2017
BONUS TRACK
114
#wcmil @andreacardinali November 18th 2017
PLUGIN - 1
CARICAMENTO ASINCRONO / DIFFERITO
• https://it.wordpress.org/plugins/async-
javascript/
LAZY LOAD
• https://it.wordpress.org/plugins/bj-lazy-load/
• https://wordpress.org/plugins/rocket-lazy-load/
PERFORMANCE
• https://wp-rocket.me/it/
• https://it.wordpress.org/plugins/w3-total-
cache/
115
#wcmil @andreacardinali November 18th 2017
PLUGIN - 2
OTTIMIZZAZIONE FRONTEND / CRITICAL
RENDER PATH
• https://it.wordpress.org/plugins/above-the-
fold-optimization/
SERVER PUSH
• https://it.wordpress.org/plugins/http2-
server-push/
CARICAMENTO CONDIZIONALE JS/CSS
• https://wordpress.org/plugins/wp-asset-
clean-up/
116
#wcmil @andreacardinali November 18th 2017
ALTERNATIVE A PAGE
BUILDER
Utilizzare ItalyStrap
• 100% made in Italy
• Veloce (scritto tenendo a mente le performance)
• SEO Friendly
http://bit.ly/ItalyStrapWCMIL17
117
#wcmil @andreacardinali November 18th 2017
WORDPRESS MEETUP
ROMAGNA
QUANDO:
ogni 1°Martedì del mese (prossimo 3 Dicembre)
DOVE:
Dinamo Coworking Space Cesena
PERCHÉ:
Per parlare di WordPress, conoscere bella
gente e condividere le proprie esperienze
wpromagna.com
@romagnawp
118
#wcmil @andreacardinali November 18th 2017
DOMANDE?
119
#wcmil @andreacardinali November 18th 2017
THANKS!
• Twitter:@andreacardinali
• Slideshare:
http://www.slideshare.net/andreacardinali
• Website: https://www.andreacardinali.it/
120

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