Adaptive Images for WordPress

Version: 0.6.70

Version : 0.6.70

Current Version

Version: 0.6.70
Version: 0.6.69
Version: 0.6.68
Version: 0.6.67

Adaptive images plugin transparently resizes your images, per device screen size, in order to reduce download times in mobile environments.

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Adaptive Images Resizes and optimizes images delivered to mobile devices, in a transparent way, so that the total download time is dramatically reduced. It works as a filter between your WordPress website and the devices and seves smaller images to them. Note that this is not a CSS nor a responsive images solution. It does not affect your themes layout and style. It simply sends smaller images to the devices without them noticing it! Fundamental goals Reduce the total download time of a web page in mobile devices dramatically. Work transparantly and unobtrusively by being independant of your theme layout and style. Be agnostic of the yet not-standardised picture element or HTML the img srcset attribute. Side benefits Respects search engines and sends them the orginal version of each image. If it does not recognise a device size it falls back to the original image size. It is lightweight, because it does not need to load the whole WordPress environment every time it server an image request. Supported formats JPEG PNG GIF (not animated) NOT Supported formats WEBP GIF (animated) CDN/Varnish/external caching services Since version 0.6.0 CDN/Varnish/external caching service support has been added as an option, in an experimental mode. This means: i) it is not thorougly tested yet ii) however, it works in almost all test cases so far...

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Sorry, pal! The plugin couldn’t pass all our tests. No hard feelings, right?

Tests done by WP Hive test script Results

Minimal impact on memory usage The memory usage of this plugin is less than the average memory usage of other plugins on WordPress.org + 200KB. Check FAQ for more.
Minimal impact on pagespeed The impact of this plugin on PageSpeed is less than the average impact of other plugins on WordPress.org + 1000 milliseconds
No PHP errors, warning, notices WP Hive automated test found PHP error/s while activating this plugin on our server
No Javascript issues WP Hive automated test found no JavaScrip error while activating this plugin on our server
Latest PHP 7.4.8 compatible The latest version of the plugin is not compatible with the latest PHP version
Latest WordPress 5.9 compatible The latest version of the plugin is not compatible with the latest PHP version
Optimized database footprint The plugin creates less than 50 database tables
No activation errors WP Hive automated test found no activation error while activating this plugin on our server
No resource errors WP Hive automated test found no resource error/s while trying this plugin on our server
Frequently updated The plugin was not updated at least once in the last 90 days

All the plugins are tested on the same server with exactly same configuration via test script that automatically activates and logs the data WP Hive shows.

All the scripts run on a VPS with 8 CPU cores and 8 GB of RAM.
The test sites are hosted on Google Cloud VM instances, one site/plugin per instance. The machine type is n1-standard-1. The server is a 8 core CPU with 8GB of RAM.
The test sites are hosted on Apache/2 server and they are tested on PHP 7.4.8 & WordPress 5.9.
The database server is MySQL 8.0.21 and the default PHP memory limit is 256M.

148K

Total Downloads

7K

Active Installation

7 years

On WordPress

0.0%

Growth Rate

1

Support Thread

54

Ratings on WordPress

00

Downloads This Week

00

Ago Last Updated

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About Adaptive Images for WordPress

Description

Adaptive Images

Resizes and optimizes images delivered to mobile devices, in a transparent way, so that the total download time is dramatically reduced. It works as a filter between your WordPress website and the devices and seves smaller images to them.

Note that this is not a CSS nor a responsive images solution. It does not affect your themes layout and style. It simply sends smaller images to the devices without them noticing it!

Fundamental goals

Reduce the total download time of a web page in mobile devices dramatically.
Work transparantly and unobtrusively by being independant of your theme layout and style.
Be agnostic of the yet not-standardised picture element or HTML the img srcset attribute.

Side benefits

Respects search engines and sends them the orginal version of each image.
If it does not recognise a device size it falls back to the original image size.
It is lightweight, because it does not need to load the whole WordPress environment every time it server an image request.

Supported formats

JPEG
PNG
GIF (not animated)

NOT Supported formats

WEBP
GIF (animated)

CDN/Varnish/external caching services

Since version 0.6.0 CDN/Varnish/external caching service support has been added as an option, in an experimental mode. This means: i) it is not thorougly tested yet ii) however, it works in almost all test cases so far iii) it bears no dangers to your installation iv) it adds a special url parameter to your image urls, so it is slightly obtrusive.

Tested with MaxCDN and Varnish up to now.
Cannot handle CSS background images (yet).

Cannot work, not even in experimental mode, with CDNs which use a different subdomain for images, because these setups completely bypass WordPress when delivering images. Feel free to ask for details on this in the support forum.

Default breakpoints

1024px wide screens
640px wide screens
480px wide screens

Since version 0.5.0 and upwards it is configurable whether the plugin should take into account the landscape or the portrait orientation of each device. HiDPI (high device pixel density or retina) screens are supported too.

How to test

The esiest way to test is with your browser's device emulation mode (Responsive Design Mode) in it' Developer Tools. You can check this out this video https://www.youtube.com/watch?v=hCAC1XUUOvw/ as an example.

Test with a tool like Webpagetest http://www.webpagetest.org/. Make sure you set the “Emulate Mobile Browser” setting in the “Advanced Settings” > “Chrome” tab.
Test with an actual mobile device, a smartphone or tablet. Watch your website load in a snap.
Check the /wp-contents/cache directory to see the /adaptive-images directory and its contents. This is where the resized images are kept and cached by default.
View an image straight from a browser and add a "?debug=true" at the end of the url like this "http://www.website.com/wp-content/uploads/2015/01/image.jpg?debug=true". This verifies that the plugin is working and should print useful debug information. If you keep seeing your image, then the plugin is not working as expected and the cause is probably a failure to update the .htaccess file properly.
Add a "?debug=original" at the end of the url of an image and you will see the orginal version of the image even when a smaller version of it should have been shown.

Incompatibilities and issues

The plugin supports Nginx, but the server’s configuration file must be manually configured like this:
location / { rewrite \.(?:jpe?g|gif|png)$ /wp-content/plugins/adaptive-images/adaptive-images-script.php; }
Windows IIS is not supported, but could be manually configured. Any IIS experts are welcome to contribute.
Cannot work, not even in experimental mode, with CDNs which use a different subdomain for images.
When using HTTPS/SSL make sure that you update all your website urls and also the urls in your WordPress General
settings page, otherwise the plugin will not be able to locate your images.
WordPress Multisite (Mu) is not supported (some plans for future support are being discussed).

Stuff to keep in mind

The plugin needs to add a little bit of code to your .htaccess file in order to function properly. It removes this code once disabled. If you are not cool with that, then… tough luck!
The plugin does not care whether the device is actually mobile or not. It checks the device screen resolution. If you have set your breakpoints big enough then it should work just as good for desktop devices as well. However, it targets mostly the mobile ones.
The resized versions of the pictures are kept in a special directory in the /wp-content/cache directory. This causes some storage overhead. It is up to you to judge whether this overhead is a sustainable option in your hosting environment. Usually it is not even remotely compared to the size of your original images directories.
The plugin does not help with (nor hinder) art direction. Simple as that. Art direction https://usecases.responsiveimages.org/#art-direction in responsive images is an entirely different, yet important, problem. This plugin does not tackle with it. But it works in a supplementary way without interfering with other solutions that do. This means that you can combine it with any art direction solution.

Credits

The plugin was originally based on the WP-Resolutions plugin https://github.com/JorgenHookham/WP-Resolutions/, but since version 0.3.0 it is a complete rewrite!
Both plugins, WP-Resolutions and this one, have borrowed ideas from the Adaptive Images http://adaptive-images.com/ solution, specially adapted for WordPress.
Many special thanks to my good friend and colleague Antonis Zachopoulos for the countless times that he provided feedback, ideas and debugging hints.
Many thanks to @railgunner for the initial idea on the CDN/Varnish/external caching service feature in the plugin support forum. It showed the way that it was indeed possible!
Thank you AJ at WpFASTER.org for being keen to test the above feature in a real environment.
Thank you to the guys over at the Pressidium team for helping with debugging the CDN/Varnish/external caching service feature and providing test environments.
Thank you Andy Gray for helping debugging the weird filesystem path issues in managed hosting environments.
Thank you @milenoi2016 for helping sort out one of the many cases of WordPress directories setup.
Thank you @minorgod for the Windows path fix.
Thank you Mark Gruffer for the global request variable exposure hint.
And, of course, a million thanks to all of you who provided useful feedback in the early versions of the plugin, where the inevitable glitches, due to server environment variations, were more than a few.

Please, do let us know how the plugin works (or doesn’t work) for you. We love comments and creative feedback!

Performance

Memory Usage

Average memory usage is 22.44 KB
This is less than 99% plugins

Page Speed

Average page loading time is increased by 0.04 s
This is faster than 99% plugins

Speed Test Benchmark Learn more how we collect the data

Before plugin activation
After plugin activation

Benchmark

Change

Average Change

- 0.04s

/(front page)

+ 0.01s

/wp-admin/edit-comments.php

+ 0.01s

/wp-admin/edit-tags.php?taxonomy=category

- 0.02s

/wp-admin/edit.php

- 0s

/wp-admin/index.php

- 0.07s

/wp-admin/media-new.php

- 0.09s

/wp-admin/options-discussion.php

- 0.2s

/wp-admin/options-writing.php

- 0.17s

/wp-admin/post-new.php

+ 0.13s

/wp-admin/post-new.php?post_type=page

- 0.07s

/wp-admin/upload.php

- 0.03s

MoreLess

Memory Usage Benchmark Learn more how we collect the data

Before plugin activation
After plugin activation

Benchmark

Change

Average Change

+ 22.44KB

/ (front page)

+ 2.18KB

/wp-admin/edit-comments.php

+ 2.66KB

/wp-admin/edit-tags.php?taxonomy=category

+ 3.79KB

/wp-admin/edit.php

+ 2.8KB

/wp-admin/index.php

+ 2.8KB

/wp-admin/media-new.php

+ 2.68KB

/wp-admin/options-discussion.php

+ 3.71KB

/wp-admin/options-writing.php

+ 1.63KB

/wp-admin/post-new.php

+ 3.25KB

/wp-admin/post-new.php?post_type=page

+ 2.69KB

/wp-admin/upload.php

+ 2.66KB

MoreLess

User Rating of Adaptive Images for WordPress from WP Hive Users

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Stats

Download Statistics

Plugin Version Usage

Database Tables

The plugin has added 0 additional options to your WordPress.

WP-Options

The plugin has added 0 additional options to your WordPress website.

Errors

PHP Compatibility Issue

The plugin has not been properly activated on PHP 7.4.8. It may not work.

WordPress Compatibility Issue

The plugin may not be fully compatible with WordPress 5.9.

Frequently Updated

The plugin has not been updated in the last 90 days.

Read more how WP Hive determines this data.

Error Log

We found the following errors while activating the plugin. Read more how WP Hive generates this data.

[30-Jan-2022 11:49:01 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/adaptive-images/adaptive-images-admin.php on line 708
[30-Jan-2022 11:49:01 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/adaptive-images/adaptive-images-admin.php on line 732
[30-Jan-2022 11:49:02 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/adaptive-images/adaptive-images-front.php on line 48

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