Bjoern

WP Performance Pack is your first choice for speeding up WordPress core the easy way, no core patching required. It features options to improve localization performance and image handling (faster upload, reduced webspace usage). Combined with CDN support for images, both on Frontend and Backend, this offers similar image acceleration as <a href="http://jetpack.me/support/photon/" rel="nofollow ugc">Jetpack’s Photon</a>.
<h4>Features</h4>
Improve localization performance
Translating WordPress is slow and uses much memory because by default WordPress loads all translations upon each request. WPPP improves performance and memory usage by using native gettext or dynamic loading of translations. If an object cache is installed optional caching improves performance even further.
<ul>
<li>Use of PHP gettext extension if available.</li>
<li>Dynamic loading of translation files, only loading and localizing used text.</li>
<li>Disable Backend localization while maintaining frontend localization (with optional override by user)</li>
<li>Caching of translations to further improve performance. A persistent object cache has to be installed for this to be effective.</li>
</ul>
Improve image handling
Create intermediate image sizes on demand not on upload.
<ul>
<li>Don’t create intermediate images on upload, instead dynamically create intermediate images when accessed.</li>
<li>Choose to save intermediate image sizes or to recreate them upon each access. Created images can be saved into a folder different from the original images folder.</li>
<li>Use EXIF thumbnail (if available) as source for thumbnail images. This improves memory and cpu usage as the source for the thumbnail is much smaller.</li>
<li>Adjust quality settings for intermediate images.</li>
<li>Regenerate Thumbnails integration: Hook into the thumbnail regeneration process to delete existing intermediate images. Supported plugins: <a href="https://wordpress.org/plugins/regenerate-thumbnails/" rel="ugc">Regenerate Thumbnails</a>, <a href="https://wordpress.org/plugins/ajax-thumbnail-rebuild/" rel="ugc">AJAX Thumbnail Rebuild</a>, <a href="https://wordpress.org/plugins/simple-image-sizes/" rel="ugc">Simple Image Sizes</a></li>
</ul>
Disable WordPress default widgets (BETA)
Really disable WordPress’ default widgets. Other plugins which allow you to disable WordPress default widgets only hide them, but the widgets’ files will still be loaded. WPPP really removes the widgets: Files of disabled widgets won’t get loaded.
CDN support
<ul>
<li>Serve (dynamically generated) images through CDN. Applies to all images uploaded via media library both on frontend and backend. No need to save thumbnails locally.</li>
<li>Fallback to local serving if CDN fails to return a valid response.</li>
<li>Dynamic image links: Image urls are generated dynamically when displaying post content.</li>
<li>Supported CDNs: CoralCDN, MaxCDN, Custom</li>
</ul>
Change or deactivate WordPress features
<ul>
<li>Disable header elements, such as generator name, feed links and more</li>
<li>Change heartbeat settings</li>
<li>Disable edit lock</li>
<li>Disable emoji support</li>
<li>Use persistent database connection</li>
</ul>

WP Performance Pack

Boost WordPress performance: Faster localization, (on the fly) dynamic image resizing and CDN support for images.

Suman Bhattarai

When you upload a large image, WordPress automatically scales it to a lower resolution while keeping the original image intact. Over time, this can lead to increased storage usage. This plugin helps you identify large images and resize them to preserve disk space and improve load times on pages where the full image is used.
Yangra Image Resizer scans for images using cron. For convenience, it displays the largest images first. Please be careful when resizing images — it’s important to do this carefully and create a backup first. Yangra Image Resizer continuously scans your images, so you may notice new images appearing on the front page when you revisit.
<h4>Features</h4>
<ul>
<li>Figure out largest size image in your WordPress install</li>
<li>Easily resize or edit the image</li>
<li>Hassle free way to optimize your images</li>
</ul>
<h3>Credits</h3>
<ul>
<li><a href="https://getbootstrap.com/" rel="nofollow ugc">Bootstrap</a> – UI</li>
</ul>

Yangra Image Resizer

Yangra Image Resizer provides an automated way of finding out large size images in your site and resize them as you see fit.

WP Performance Pack vs Yangra Image Resizer