Bradley Taylor

This plugin disables the custom fields metabox that WordPress includes by default. The custom fields metabox includes a slow query, which on large sites can take 10+ seconds.
Do not install this plugin if you rely on the custom fields metabox. If you do not know what this means you should probably not install this plugin. If you are using a plugin such as Advanced Custom Fields, Custom Field Suite or similar to manage your custom fields don’t worry – these plugins will be unaffected.
The custom fields metabox performance is currently being discussed in <a href="https://core.trac.wordpress.org/ticket/33885" rel="nofollow ugc">Trac</a>. If you find this plugin useful you may want to follow that ticket.

Remove custom fields metabox

Remove the custom fields metabox to improve performance.

Vadym

Extra User Details is the simple plugin that allows you to add extra fields to the user profile page (e.g. Facebook, Twitter, LinkedIn links etc).
Extra fields can be easily accessed in your templates like a general wordpress author details:
<pre><code><?php the_author_meta('meta_key'); ?>
</code></pre>
Plugin saves fields data in wp_usermeta table. You can add and edit extra fields at plugin options section in backend.

Extra User Details

Took me a bit to get this out, since there is no help online.
I wrote a little function and pasted it into my functions.php:
function extra_user_info() {
		global $current_user;
			get_currentuserinfo();

		echo 'Your extra user info is' . $current_user->PUT_YOU_ID_HERE ;      		

	}

add_action ('NAME_OF_HOOK_WHERE_YOU_WANT_IT', 'extra_user_info', 20);


How to display the correct values in the frontend

Add extra fields to the user profile page, saved in WordPress' native way (in wp_usermeta).

Remove custom fields metabox vs Extra User Details