# 3. Install cache

Remember, **Penci Speed Optimizer** is not a cache plugin. After optimizing the website structures according to the pagespeed insight knowledge, you need to install a cache plugin to speed up your website.

Some popular cache plugins for WordPress such as: WP Rocket, WP Fastest Cache, W3 Total Cache, WP Supper Cache. You can pick one caching plugin and use it.

### WP Rocket

**Cache** tab: turn on 2 options

* Enable caching for mobile devices
* Separate cache files for mobile devices

Tab "**File Optimization**": **Turn OFF all options**

Tab "**Media**": **Turn OFF** the following options

* Enable for images 
* Enable for iframes and videos

Tab **"Preload":** **Turn OFF** Preload Links

![](/files/-MYPL57e0B3H5SPbVpRH)

### WP Fastest Cache

Enable the following options

![](/files/-MYPLgOkytICqAofsAlG)

For other cache plugins, configure it in principle:

* Do not enable features: **lazyload, merge + minify CSS & JS**
* Do not enable **CDN feature, Lazy, Rocket on external service CDN like Cloudflare, Godaddy**

Because it may conflict with the Penci Speed Optimizer plugin

### Cloudflare

When you using Cloudflare you need to disable the following features.

**Rocket Loader**

Rocket Loader is a feature of Cloudflare in support of website speed up. However, it's completely unnecessary for our optimization plugin.

After enabling the Rocket feature in Cloudflare, you will see "rocket-loader" text when run view-source mode in the browser. Remember, any functionality that involves modifying your website's HTML from outside the PHP code will conflict with our **Penci Speed Optimizer** plugin code. So you need to turn it off.

To disable, open the Cloudflare panel, go to the **Speed** tab and scroll down to the "Rocket Loader" section and select off.

![](/files/-MYPMJdJwWMaEVObsXtp)


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