Slide 1
Slide 1 text
By Thijs Feryn
How to improve the
performance of your
website
Slide 2
Slide 2 text
Hi, I’m Thijs
Slide 3
Slide 3 text
I’m
@ThijsFeryn
on Twitter
Slide 4
Slide 4 text
I’m an
Evangelist
At
Slide 5
Slide 5 text
I’m a
at
board member
Slide 6
Slide 6 text
Web performance
is an essential part of
the user experience
Slide 7
Slide 7 text
Infrastructure
Slide 8
Slide 8 text
Code
Slide 9
Slide 9 text
Browser
rendering
Slide 10
Slide 10 text
User location
Slide 11
Slide 11 text
Down
Slowdown ~ downtime
Slide 12
Slide 12 text
Focus on the foundation first
Slide 13
Slide 13 text
Fast servers
Slide 14
Slide 14 text
Performance
!=
Scalability
Slide 15
Slide 15 text
Performance: speed
Slide 16
Slide 16 text
Scalability: constant speed
with increasing load
Slide 17
Slide 17 text
Add servers
to maintain
performance
Slide 18
Slide 18 text
Stability
Slide 19
Slide 19 text
Code efficiently
Slide 20
Slide 20 text
Identify slowest part
Slide 21
Slide 21 text
Optimize database
Slide 22
Slide 22 text
Optimize runtime
Slide 23
Slide 23 text
After a while you
hit the limits
Slide 24
Slide 24 text
Don’t
recompute
if the data
hasn’t
changed
Slide 25
Slide 25 text
Cache
Slide 26
Slide 26 text
Memcached
Redis
APC
Slide 27
Slide 27 text
No content
Slide 28
Slide 28 text
Optimize database
Optimize runtime
A
void
A
void
Slide 29
Slide 29 text
Don’t
recompute
if the data
hasn’t
changed
Slide 30
Slide 30 text
Varnish
Slide 31
Slide 31 text
Normally
User Server
Slide 32
Slide 32 text
With Varnish
User Varnish Server
Slide 33
Slide 33 text
Caching in your architecture
Slide 34
Slide 34 text
Respect HTTP
Slide 35
Slide 35 text
Cache-control: public, max-
age=3600, s-maxage=7200
Cache-control: no-cache, no-
store
VS
Slide 36
Slide 36 text
Cookies?
Slide 37
Slide 37 text
Edge Side
Includes
Slide 38
Slide 38 text
No content
Slide 39
Slide 39 text
Don’t cache header
Slide 40
Slide 40 text
Cache footer until
31/12/2015 23:59:59
Slide 41
Slide 41 text
Cache for a day
Slide 42
Slide 42 text
Cache for an hour
Slide 43
Slide 43 text
The Demo
{% block content %}{% endblock %}
ESI tags
Slide 44
Slide 44 text
Hit rate
Slide 45
Slide 45 text
Browser
rendering
Slide 46
Slide 46 text
✓Concurrency limitations
✓Slowband, bad mobile
connection
✓First byte time
✓Rendering time
✓Limit resource size
✓Limit resource amount
✓Re-use TCP connections
Slide 47
Slide 47 text
Compress
images,
JS & CSS
Slide 48
Slide 48 text
Combine
multiple JS
& CSS
into one
file
Slide 49
Slide 49 text
Right
image size
for the
right
device
Slide 50
Slide 50 text
Non-
blocking
Javascript
Slide 51
Slide 51 text
Google
PageSpeed
Insights
&
Web Page
Performance Test
Slide 52
Slide 52 text
User location
Slide 53
Slide 53 text
Caching in the edge
Slide 54
Slide 54 text
Content Delivery Network
Slide 55
Slide 55 text
Faster responses per
request
Slide 56
Slide 56 text
Don’t saturate your own
network
Slide 57
Slide 57 text
No content
Slide 58
Slide 58 text
No content
Slide 59
Slide 59 text
No content