Spike: Disable or improve performance of post counts on the users page

[srtfisher]

Description

The users' page in WordPress admin (/wp-admin/users.php) uses an uncached function call to count_many_users_posts() that does not perform well on large sites for the initial page load.

Consider how we can optimize this query OR remove the post count from appearing on the page.

Use Case

When a user browses to the users page on a large WordPress site they should be able to load the users in a timely manner.