cybio

With this plugin you can cache gravatar images on your server (and they will be delivered with the cache settings of your webserver).
Please report bugs and/or feature-request to our ticket-system: <a href="http://trac.splash.de/glc" rel="nofollow ugc">Bugtracker/Wiki</a>. 
For Support, please use the <a href="http://board.splash.de/forumdisplay.php?f=105" rel="nofollow ugc">forum</a>. 
Latest development news: <a href="http://twitter.com/cybiox9" rel="nofollow ugc">Twitter</a>.
<h3>ToDo</h3>
<ul>
<li>[NEW] cronjob to refresh cached images</li>
</ul>

GravatarLocalCache

Local cache for gravatar images (saves dnsqueries and let you control cache/proxysettings of the images).

Ciprian

W3P SEO has options for search engines, such as ownership verification, local business JSON-LD data, Open Graph, analytics, header and footer easy code insertion and optimized SEO defaults.
W3P SEO also features native XML sitemaps and advanced topic clustering settings.
For support, feature requests and bug reporting, please visit the <a href="https://getbutterfly.com/wordpress-plugins/" title="getButterfly" rel="nofollow ugc">official website</a>.

W3P SEO

W3P SEO provides the minimum SEO/SEM/local/marketing options for any site owner.

GravatarLocalCache vs W3P SEO