WP Smush Pro 3.18

Improved: Smush API upgrades and improvements for better memory management
Fix: Prevent broken images on Smush CDN when using relative links
Fix: Hummingbird Performance Test conflicts
Fix: Missing thumbnails when using PNG to JPG conversions

Fix: Smush API handing improvements

Improvement: Reduced memory consumption during the Smush process
Improvement: Better directory Smush compatibility with Flywheel
Fix: Unicode characters in image URLs causing issues
Fix: Improved compatibility with native lazy loading
Fix: PHP errors and warnings