Performance improvement of WordPress by using WebP as image

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This is one of WordPress accelerating activities.

This article is for using WebP as image format to be sent to client.
WebP: New image format which was made by Google.



Other improvements are in this article.

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What I did

I use this as base docker-compose.

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I installed this plugin to WordPress.
This plugin is cool because,
– Converting existing image file to WebP format.
– Converting newly uploaded image file to WebP format automatically.



I installed but faced below error.
– GD or Imagick has to be installed.



I changed Dockerfile to install imagick.

RUN	apt -y install libmagickwand-dev && \
	pecl install imagick && \
	docker-php-ext-enable imagick && \
	(snip)



I faced another error.
– rewrite_not_executed means rewriting URL or something like that?



I found

If you are using a Nginx server, ...

in this error message which indicates I need to configure Nginx.

I also found this configuration.
When I changed to Pass Thru, error message was removed.



If you use some cache plugins you need to delete existing cache before production.



I found button which converts existing image files to WebP.



About 20 mins passed after I clicked Regenerate All, then error happened.
There is 504 timeout.



Timeout value has to be extended.

This is configuration of reverse-proxy which is https-portal.
Only need to add below line.
– This example shows setting 300 secs.

   environment:
+    CUSTOM_NGINX_SERVER_CONFIG_BLOCK: 'proxy_read_timeout 300;'



This is timeout configuration of Nginx <-> php-fpm.
I added these lines to nginx/conf.d/default.conf.

 server {
    location ~ \.php$ {
+       fastcgi_read_timeout 300;
    }
 }



I tried again.
After 1 hour, completed.



You can confirm by accessing some blot post.
If you find content-type WebP is returned when you access image, then well done!

Before vs after



I measured with below condition.

- Using LightHouse in Developers Tools of Chrome browser.
  Checking Performance only
- Taking median as representative(n = 5).
- Measuring on secret tab of Chrome.


Before
<—Mobile Desktop—>



After
<—Mobile Desktop—>



Desktop has decreased, but Mobile drastically improved from 21 to 42 which is 200% higher!

Conclusion

How was it?

No program modification required!

Let’s do it , why not?

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