If you use W3 Total Cache plugin, please follow this guide to know how to setup this plugin to work well with Nitro.

Step 1: On WP Dashboard sidebar, click on User Agent Group.

 

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Step 2: Click on Create a group

 

Then enter group name

 

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Step 3: Pick up theme as “WR Nitro”

 

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Step 4: Enter this below text into “User agents”

 

Then click “Save Settings & Purge Caches”