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With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly. 
The shortcode is <code>[authorsindex]</code>.
Options are: 
 *ul => the class of you ul element (default = iapAlpha) 
 *li => the class of you li element (default = iapAlpha) 
 *letter => the class of you span element(the letters) (default = iapLetter) 
 *hide_empty => diplay authors that don’t have any article (default = false) 
 *optioncount => display number of post of the author (default = true) 
 *show_fullname => show full name of the author (default = false) 
 *exclude_admin => exclude the admin (default = false) 
 *menu => show a menu of the index (buddypress-like) (default = true) 
 *listpost => display a list of the post of the author in a nice tooltip
<h3>Demonstration</h3>
You can see an example of the functionnality of this plugin at <a href="http://kune.fr/index-des-auteurs/" title="Kune.fr Auteurs Index Page" rel="nofollow ugc">Kune.fr</a>
<h3>Changes</h3>
<ul>
<li>1.1 : Less bugs, one more option to display a list of post of the author in a nice tooltip</li>
<li>1.0 : First release of the plugin</li>
</ul>

Index Authors page

With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly.

OllieJones

This plugin speeds up the handling of your WordPress registered users, especially when your site has many thousands of them. (Congratulations! Building a successful site with thousands of users is an accomplishment.) With optimized MySQL / MariaDB database techniques, it finds and displays your users more quickly. Your All Users panel on your dashboard displays faster and searches faster. Your All Posts and All Pages panels no longer lag when displaying. And, you can edit your posts to change authorship more efficiently.
Without this plugin WordPress sites with many users slow down drastically on Dashboard pages. It can take many seconds each time you display your Users dashboard panel. It takes just about the same large amount of time to display your Posts or Pages panels. While those slow displays are loading, WordPress is hammering on your site’s MySQL or MariaDB database server. That means your site serves your visitors slowly too, not just your dashboard users.
And, versions of WordPress since 6.0.1 have dealt with <a href="https://make.wordpress.org/core/2022/05/02/performance-increase-for-sites-with-large-user-counts-now-also-available-on-single-site/" rel="nofollow ugc">this performance problem</a> by preventing changes to the authors of posts and pages in the Gutenberg editor, the classic editor, and the Quick Edit feature. Those recent versions also suppress the user counts shown at the top of the Users panel. This plugin restores those functions.
This plugin helps speed up the handling of those large numbers of users. It does so by indexing your users by adding metadata that’s easily optimized by MySQL or MariaDB. For example, when your site must ask the database for your post-author users, the database no longer needs to examine every user on your system. (In database jargon, it no longer needs to do notoriously slow full table scans to find users.)
When slow queries are required to make sure the metadata indexes are up to date, this plugin does them in the background so nobody has to wait for them to complete. You can set the plugin to do this background work at a particular time each day. Many people prefer to do them overnight or at some other off-peak time.
<h4>How can I learn more about making my WordPress site more efficient?</h4>
This is a companion plugin to <a href="https://wordpress.org/plugins/index-wp-mysql-for-speed/" rel="ugc">Index WP MySQL for Speed</a>. If that plugin is in use, this plugin will perform better. But they are in no way dependent on one another; you may use either, both, or of course neither.
I offer several plugins to help with your site’s database efficiency. You can <a href="https://www.plumislandmedia.net/wordpress/performance/optimizing-wordpress-database-servers/" rel="nofollow ugc">read about them here</a>.

Index WP Users For Speed

This is absolutely amazing work. I've reviewed your discussions on WP issue tracker and various other places and came to the same conclusion. While I had already added some of my own custom indexes long ago, this is even better. Fantastic job!

Amazing

It’s great to see a plugin like this created and maintained to such a high standard. Thank you Ollie

Top class

Do you have thousands of users on your WordPress site? Look them up fast. Find authors more easily. Speed up your laggy dashboard.

Index Authors page vs Index WP Users For Speed