Wordpress What is the best and fastest cache for wp

Pretty much what @RoldanLT said though I'll elaborate on the centmin.sh menu option 22 options

In context of Wordpress caching for centmin.sh menu option 22 wordpress auto installer for Centmin Mod 123.09beta01 and newer, you have 3 offered wordpress caching options:

1. Redis Nginx Level Caching - centmin.sh menu option 22 will auto install redis if not detected if you choose this in centmin.sh menu option 22 setup. Otherwise, need to install redis yourself.
2. KeyCDN Cache Enabler for full page static html caching (safest choice for balance of performance and reliability)
3. WP Super Cache for full page static html caching

1. redis caching at nginx level can be fastest but needs fine tuning and deep understanding of your web app and it's plugins to get right i.e. woocommerce etc. So can be problematic too. Most caching is are for guest caching only.

2. keycdn cache enabler wp plugin - better version of wp super cache for full page static caching of wordpress. Least problematic and closest to set and forget with maybe some tuning needed depending on wp plugins and site configuration. Config is for guest caching only.

And regardless of caching method, having right server(s) hardware and configuration and LEMP stack and system TCP level configurations to handle the traffic is a must otherwise regardless of caching used, it won't scale. So you would want non-OpenVZ based VPS like KVM or dedicated. Choosing OpenVZ VPS will limit your scalability.

FYI, all caching methods = generally higher memory consumption and sometimes higher cache related cpu consumption. The goal of caching in context of wordpress is usually to lessen the load placed on php/php-fpm as that is the weakest part of any LEMP/LAMP setup in terms of scalability. So sometimes caching isn't necessary faster just scales better in high concurrent traffic environments.

You can see centmin.sh menu option 22 wordpress installed demo and benchmarks on my Wordpress7 demo site.

 

You'd have to remove any previous wordpress caching and then setup redis nginx level caching.

There's 3 (4th optional) steps

1. install redis server
2. install redis object cache wp plugin <-- probably skip this as it's known to cause issues when updating wp admin settings
3. setup nginx level redis full page caching
4. optional step setup PHP session storage via redis

You can also do a 2nd dummy centmin.sh menu option 22 domain test site and choose redis nginx level caching to let centmin.sh install redis server first so you don't have to do first step above. Then you can compare dummy domain's nginx vhost config to your live wordpress nginx vhost to get a better idea of what needs changing.

 

php redis 4.x branch has breaking code changes compared to 3.1.6 so stick with 3.1.6 for now PECL :: redis Changelog

AFAIK, php redis 4.x is for PHP 7.3.x

 

Get rid of w3tc if it doesn't allow purging of redis caching. centmin.sh 22 redis nginx level cache allows purging via nginx help wp plugin outlined when setup nginx level redis full page caching as the cache key is setup by centmin.sh menu option 22's php-fpm redis caching setup



or as outlined above best problem free setup is keycdn cache enabler wp plugin Wordpress - What is the best and fastest cache for wp