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wpbakery says

Lately I’ve switched to use native WP image/thumbnails generation, rather then timthumb.php. Because WP is actually generating images at the upload process, and then images are loading faster (because they are static).

But here is a problem, When you change thumbnail/image dimensions under the settings->media old images will remain same size :( Is there a way to force WP to regenerate old images to the new dimensions?

This is very actual if you have existing site and simple upgrading/changing the theme.

Help… and Thanks!