Easily optimize images using wp-cli, https://github.com/TypistTech/image-optimize-command
wp package install typisttech/image-optimize-command:@stable
# optimize specific attachments
$ wp image-optimize attachment 123 223 323
# optimize certain number of attachments
$ wp image-optimize batch --limit=20
# restore the full sized images of specific attachments
$ wp image-optimize restore 123 223 323
$ wp media regenerate 123 223 323
# restore all full sized images and drop all meta flags
$ wp image-optimize reset
$ wp media regenerate
# Find and optimize images under a given directory **without backup**
$ wp image-optimize find /path/to/my/directory --extensions=gif,jpeg,jpg,png,svg,webp
# shortcusts for `wp image-optimize find` **without backup**
$ wp image-optimize mu-plugins
$ wp image-optimize plugins
$ wp image-optimize themes
$ wp image-optimize wp-admin
$ wp image-optimize wp-includes
# learn more
$ wp help image-optimize
$ wp help image-optimize <subcommand>