How to achieve high performance in WordPress?

[szepeviktor]

Item	Tool	Speedup
Infrastructure	CPU, disk, web server, PHP and DNS	Overall performance
In-memory object cache	Redis, Memcached, APCu	options, post, post meta etc.
Server-side functionality plugins (backup, db cleanup)	Use WP-CLI instead	Degrades performance
Theme and plugins	Cache-aware ones using object cache or transients
Translations	tiny-translation-cache	.mo file parsing
Navigation menus	tiny-nav-menu-cache	wp_nav_menu()
Post content	tiny-cache	the_content()
Widgets	widget-output-cache plugin	dynamic_sidebar()

You run already on UpCloud - which is the best cheap enterprise-grade provider - and using Redis. https://github.com/szepeviktor/wordpress-speedtest

Please consider testing the Tiny cache family: https://github.com/szepeviktor/tiny-cache

[ottok]

So the Tiny cache family requires the theme code to be edited, in order to wrap content calls with your library? The installation instructions seem a bit unclear.

You have a lot of interesting stuff in your repos. My favorite is https://github.com/szepeviktor/debian-server-tools :)

[szepeviktor]

requires the theme code to be edited,

Only one of the sisters need code modification: the post content cache. It is very sad that the_content() cannot be properly hooked.

The other two need only copying the MU plugin file in place.