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Pradeep Sonawane

Gmail Like Gravatar Fallback plugin converts default WordPress Gravatar into Gmail App like Gravatar which shows the initial letter of the user in a random background color.
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<li>You can also add your styling to your stylesheet to customize the default gravatar after activating the plugin. Once the plugin is installed, it detects the user gravatars which are not set and are default, then they will be converted to SQUARE ICONS with First Letter of User’s Name.</li>
<li>This plugin also keeps the default gravatar settings, so once plugin is deactivated, old setting will be applied again.</li>
<li>This will show Gmail APP like gravatars in Comments list and Users / Members list.</li>
<li>This plugin has no settings, it just uses converts the default Gravatars using jQuery.</li>
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Requirements: 
1. In the HTML markup, the Author Name should be sibling of Author Gravatar. 
2. The Author name should have “fn” class. <a href="http://impradeep.in/gmail-like-gravatar-fallback-wordpress-plugin" rel="nofollow ugc"></a>To know more click here…
Please note: Our default WordPress comments section already shows markup in the link above. 
So if want to use these Gmail like Gravatar Fallback in some other custom templates, then you can reform the structure to look like the above.

Gmail Like Gravatar Fallback

Gmail Like Gravatar Fallback plugin converts default Gravatar into Gmail App like Gravatar.

FolioVision

There’s one problem with Gravatars. They are very slow to load. Each page with comments on them makes one call per comment to the Gravatar server. While a single call takes only a 100ms, on a page with hundreds of comments, we are talking about major slowdowns. Page loads can take 20 seconds and more.
This plugin solves this problem by:
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caching gravatars with WordPress cron job..
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caching gravatars on comment submission
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maintaining a single copy of the default gravatar instead of downloading it again and again for all the email addresses with no gravatar associtated
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<a href="http://foliovision.com/seo-tools/wordpress/plugins/fv-gravatar-cache/installation" rel="nofollow ugc">Installation guide</a>
<a href="http://foliovision.com/seo-tools/wordpress/plugins/fv-gravatar-cache" rel="nofollow ugc">Support and more information</a>

FV Gravatar Cache

I deactivated plugin but still contains elements in Database

Database Junk

Speeds up your website by making sure the gravatars are stored on your website and not loading from the gravatar server.

Gmail Like Gravatar Fallback vs FV Gravatar Cache