Hi there,
if you’re looking for a plugin to convert images to webP then i believe they require a premium subscription.
if you want to improve the current image loading performance, try adding this PHP Snippet to your site:
function db_modify_srcset_sizes($sizes, $size) {
$sizes = '(max-width: 360px) 300px, (min-width: 361px) 768px, (min-width: 769px) 1024px, 100vw';
return $sizes;
}
add_filter('wp_calculate_image_sizes', 'db_modify_srcset_sizes', 10 , 2);
It will tell the browser to load the medium size image on mobile devices instead of the full size image.
Make sure to clear any caches afterwards.