WP Rocket - WP Rocket offers a caching plugin for Wordpress.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Yoast - Yoast offers plugins to improve SEO and optimize web sites and blogs.
ImageOptim - Faster web pages and apps.
Wordfence - Comprehensive security plugin for WordPress.
TinyJPG - Compress JPEG images with perfect quality and file size