Redirection to AMP is too slow

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Thanks. The redirection is slow for two reasons:

1. Mobile redirection by default is performed via client-side JS redirection. This is slower than server-side redirection, but it is more compatible across sites. If your cache layer(s) are caching pages with respect to the mobile user agent, you can enable server-side redirection via this PHP plugin code: add_filter( 'amp_mobile_client_side_redirection', '__return_false' );
2. You have an optimization plugin which is concatenating and minifying all JS on the page and moving it to the footer, including the AMP plugin’s JS for client-side redirection which is added at the wp_head action. For this reason, the entire page is loaded before redirection is done. If you can exempt concatenation for the JS that contains the string amp_mobile_redirect or amp-mobile-version-switcher then the speed should be greatly improved. This was done by default in one such optimization plugin.

• This reply was modified 3 years, 9 months ago by Weston Ruter.
• This reply was modified 3 years, 9 months ago by Weston Ruter.
• This reply was modified 3 years, 9 months ago by Weston Ruter.

If you can confirm which plugin you’re using that is concatenating and moving the JS redirection code, we can submit an issue to the plugin author to prevent it from being processed by default.

1. Should I insert this redirect code below, in my theme’s function.php?
add_filter( 'amp_mobile_client_side_redirection', '__return_false' );

2. I am using the WP-Rocket cache plugin.

2. I disabled the “Combine JavaScript files” feature of WP-Rocket (https://prnt.sc/xvu4a1) and the score improved a lot (https://prnt.sc/xvubt2).

The problem is that when it disable this feature, the desktop score gets worse: https://prnt.sc/xvudua

And another detail… although the score improves when disabling the “Combine JavaScript files” feature, it is not as good as directly accessing the amp version: https://prnt.sc/xvukj2

Should I insert this redirect code below, in my theme’s function.php?

Since you are using the legacy theme, you can put it in the functions.php. But ideally you’d put it in a custom plugin so you can switch to a full Reader theme later.

The problem is that when it disable this feature, the desktop score gets worse

I bet there is a way with WP Rocket to keep the feature enabled but to exclude just the script for mobile redirection. We’ll investigate and get back to you next week, ideally with a patch for WP Rocket itself.

I inserted the code in function.php and the score improved a lot: https://prnt.sc/xx9itn

If you find a way to delete only the mobile redirect script in Wo-Rocket, I think it’s better than using code in function.php

If the HTTP redirect works for you, then it will actually be better. It will always be faster.

Instead of putting the code in your theme’s functions.php, you can put it in a separate plugin like so: https://gist.github.com/westonruter/e5032d805625f0f743237708c43d3783

I removed the code from function.php, installed the “AMP Mobile Server-Side Redirection” and it is redirecting perfectly.

I activated the plugin and the redirection is already working automatically. So I don’t need to insert the code in this plugin, right? It seems that this plugin doesn’t even have a configuration screen (at least I didn’t find it).

Do I need to install and maintain the “GitHub Updater” plugin? If I don’t have this plugin installed, won’t the “AMP Mobile Server-Side Redirection” plugin be updated?

I activated the plugin and the redirection is already working automatically. So I don’t need to insert the code in this plugin, right? It seems that this plugin doesn’t even have a configuration screen (at least I didn’t find it).

Correct. There is no UI. This plugin is used instead of adding the code to functions.php.

Do I need to install and maintain the “GitHub Updater” plugin? If I don’t have this plugin installed, won’t the “AMP Mobile Server-Side Redirection” plugin be updated?

You don’t need to install that plugin, no. It’s doubtful this plugin will be updated in any way.

Thank you for your attention.