Don Caprio

As the name implies, this social sharing plugin is simple and loads pretty fast. The buttons do not rely on external resources to load, it’s written in PHP, HTML and CSS.
There’s an option to show the buttons on posts and pages. You can also put the buttons anywhere in your template using this template tag:
<pre><code><?php dc_social_share_tag(); ?>
</code></pre>
You can also display using this shortcode in single posts and pages:
<pre><code>[dc-social]
</code></pre>
Please note that these buttons do not show share counts. The essence of the whole thing is to keep it very simplified.
The only button that requires a little snippet of JS to work is the Pinterest button but this does not slow down your site in anyway. A demo of the plugin can be seen here: http://geek.ng/

DC Simple Share Buttons

A set of very simple social sharing buttons that loads pretty fast (no javascript, no images).

MikesPickz

The MP Share Center allows you to easily add share buttons to your posts and pages.
The plugin will add Facebook Like, Twitter Tweet, LinkedIn Share, Pinterest Pin, Pocket and email buttons or boxes, above or below the front page/post/page/archive/search pages if you enable these options.
For the Facebook Like Button, the plugin will automatically take the first image from a post and use that as the thumbnail.
This plugin loads Javascript in the footer, which improves page load (by allowing content to appear first) and therefore benefits SEO and search engine ranking.
You can display the MP Share Center on any page type with the use of the shortcode <code>[mp_share_center]</code>. The shortcode defaults to use the buttons format. To choose the boxes format, simply add the <code>type='boxes'</code> parameter, ie: <code>[mp_share_center type='boxes']</code>. If you want to insert the call to action via the shortcode, use <code>[mp_share_center type='cta']</code>. Which social networks the shortcode displays is controlled on the MP Share Center Settings page.

MP Share Center

The MP Share Center allows you to easily add share buttons to your posts and pages.

DC Simple Share Buttons vs MP Share Center