The transient is in place just fine, see get_dir_size() source.
Note that if you have enough files for this to cause major performance issues you are probably better disabling upload limit or it might mess up other related functionality like uploads.
Related Posts:
- How do I remove dashboard access from specific user roles?
- How to Change the Default Home Page for the WordPress Dashboard?
- 3.3: How do you hide the new dashboard welcome panel?
- How can we customize the logo and some text on the welcome screen?
- Can I set a default dashboard layout for all users?
- Appearance->Editor not visible
- Which hook for processing plugin page form data?
- How to get view count of every page on site and add that (increasing) number to Dashboard Widget
- Dashboard menu missing
- Can’t access dashboard as administrator, login as any other level works though
- Get post attached image to display in admin dashboard
- Continuous Login Sessions For Super Admins Across Multi-Site Network of Sites
- Modifying the built-in behavior of ajax tag type-ahead functionality of WordPress
- How to activate the dashboard
- Backend Checkboxes working – but not visual?
- Given multiple admin accounts, how can I make it so that only admin with X username can edit posts
- Top toolbar is not showing in wordpress admin panel
- Want to know who is login Admin/User
- Dashboard RSS Widget Overhaul
- Extending the user profile [closed]
- How To Create WordPress Dashboard Item
- Adding a WordPress Admin Dashboard to my local wordpress site
- Sortable admin columns by 0.00 number
- WordPress4.1.15 Dashboard links not working
- Unable to render Admin Notices
- My code for creating an admin option doesn’t work
- WP Logs me out after updating anything on dashboard
- TinyMCE buttons broken
- WordPress admin panel is blank
- 500 error for regular users, not for admin
- What are the standard admin CSS id/class tags?
- How to filter post listing (in WP dashboard posts listing) using a custom field (search functionality)?
- Admin Ajax is returning 0
- Add custom column to Users admin panel
- wp_verify_nonce vs check_admin_referer
- Add a Separator to the Admin Menu?
- How to determine whether we are in add New page/post/CPT or in edit page/post/CPT in wordpress admin?
- how to know if admin is in edit page or post [duplicate]
- Modal window from within WordPress admin
- Where in WP can I check history or log of updates of plugins etc?
- Adding a custom admin page
- How does admin-ajax.php work?
- How to remove entire admin menu?
- How can I speed up my WP admin section?
- How to pass parameters to admin_notices?
- Admin: very slow edit page caused by core meta query
- if admin is logged in
- Search posts by ID in admin
- Setting admin edit panels & metaboxes positions and visibility for ALL users and admins
- Find out which moderator approved comment?
- The website cannot display the page
- How To Remove WordPress Version From The Admin Footer
- Sort pages in loop by admin’s page attributes order field?
- Edit “thank you for creating with WordPress” in version 3.3.1
- Hide other users’ posts in admin panel
- Set Default Admin Colour For All Users
- Editor Styles and Typekit
- WordPress admin stylesheet
- This CSS Stuffing Works, But Is This A Good Practice?
- Is it possible to create a WordPress tour? V3.3.1
- Securing Admin Accounts – Username Discovery
- is_admin() returns true when using admin-ajax.php from front end script
- How to save dismissable notice state in WP 4.2?
- How do I optimize a custom post type admin page with 25,000 posts?
- Settings API – adding setting fields dynamically?
- Disable Media Uploads to non Admin Users
- How do I load a CSS style into WordPress admin area only?
- Allowing admin-ajax.php to receive “application/json” instead of “x-www-form-urlencoded”
- Can an admin check passwords of registered users?
- How can I target WordPress 3.8 new interface MP6 with CSS?
- Notification that the admin is online
- Does wordpress create activity, update logs?
- sort child pages on admin
- How-to make the admin area mobile friendly [closed]
- How to remove list view from media library?
- How to disable the “Your site has updated to WordPress x.y.z” admin email?
- Load plugin scripts and styles only on plugin page
- Plugin to remove Admin menu items based on user role?
- How to obtain the user ID of the current profile being edited in WP-Admin?
- Add my own button next to “Screen options” and “Help” in the admin
- How to Change the Categories Order in the Admin Dashboard?
- WP List Table custom quick edit box – post meta data missing and columns change on submit
- Settings API – easiest way of validating checkboxes?
- Are there any action like ‘init_frontend’
- Should I use is_admin() inside ‘admin_init’ hook callback
- Custom admin email for new user registration
- Send Admin Emails to Multiple Email Addresses
- How do I set up the defualt page icon for admin menu?
- Prevent author from changing their posts if admin has modified
- Cannot access admin panel
- Make A WordPress Page Accessible To Admins Only, Redirect Other User Roles
- Disable all https in WordPress
- localhost/wp-admin on my local redirects to production site’s /wp-admin
- How to remove administrator role in settings -> general -> New User Default Role?
- Is there a more efficient admin search function/plugin?
- Can a users profile be put under the dashboard menu
- WordPress Admins or Roles per Page
- Styling Shortcodes in Visual Editor
- initial sort order for a sortable custom column in admin
- Showing WP_Error message with admin_notice action hook