I used this presentation for the meeting of the WP Sofia User Group during February 2014.

1. WordPress Server
Optimizations
Даниел Канчев
WordPress Sofia User Group
Февруари 2014

2. Даниел Канчев
@dvkanchev
Performance Guru @SiteGround
Security Freak
Server Migrations Specialist
VIP Customer Management
FOSS Addict
Addicted to extreme sports

3. Защо трябва да оптимизирате?
По-доволни потребители —>> $$$
По-добри позиции в Google/Yandex
По-ниски разходи за web hosting

4. Направете план

5. Основни моменти в оптимизацията
Web server setup - Apache or nginx
PHP setup - PHP-FPM, FastCGI, APC
MySQL setup
Object caching - Memcached/Redis
Full page (HTTP) caching - Varnish, nginx

6. MySQL
Използвайте Percona - http://www.percona.com/
Използвайте tmpfs за MySQL tmpdir - http://goo.gl/
UOTjlW
MySQLtuner.pl - http://mysqltuner.pl

7. PHP
PHP handlers - DSO, SuPHP/SuExec, FastCGI/PHP-FPM
PHP modules info
Opcode caching, object caching - APC, xCache, Memcached,
Redis

8. WordPress Interaction with
Your Database
First request goes to
the database server

9. Object Caching
First request goes to the
database server
Objects are also stored in
Memcached

10. Object Caching
All consecutive requests are
forwarded to the Memcached server

11. How PHP Works
Scanning
Lexing
Parsing
Compilation
Opcode
Execution

12. PHP Opcode Caching
!
Opcode
Execution

13. Reverse Proxy Servers

14. Reverse Proxy Servers

15. Reverse Proxy Servers

16. Reverse Proxy Servers

17. nginx config which works
http://polihronov.wordpress.com/

18. Varnish config
# Never cache administrator
if (req.url ~ "wp-(login|admin)" || req.url ~ "preview=true") {
return (pass);
}
if (req.http.Cookie ~ "(^|;s*)(wpSGCacheBypass=1)(;|$)") {
return(pass);
}
if (req.http.Cookie ~ "(^|;s*)wordpress_logged_in_([^;]+)(;|$)") {
return(pass);
}
if (req.http.Cookie ~ "(^|;s*)(woocommerce_items_in_cart=1)(;|$)") {
return(pass);
}
if (req.http.Cookie ~ "comment_author") {
return(pass);
}
!
include "common.vcl";
!
return (lookup);

19. To CDN or not to CDN ?

20. Изводи
Оптимизацията е процес, а не събитие.
Винаги тествайте. Пазете информацията от всички
тестове.
Информирайте се от големите акули.

21. Полезни линкове
http://highscalability.com/
http://www.mysqlperformanceblog.com/
http://wiki.nginx.org/WordPress
http://velocityconf.com/

22. Bash Мерси!
@dvkanchev / daniel.k@siteground.com