Michael Thomas

404 errors are generally very ‘expensive’ on WP sites as they cause WP to run on every attempt, slowing 
down your site and causing additional load on your web hosting environment.
WP Speed 404 can either suppress or log and email any 404 errors affecting your site under wp-content, wp-admin and 
wp-includes (configurable).

WP Speed 404

WP Speed 404 can either suppress or log any 404 errors affecting your site under wp-content, wp-admin and wp-includes (configurable).

Kaspars

Set any page to be used as the 404 error page under “Settings > Reading”.

Custom 404 Error Page

Use any static page as the 404 error page.

WP Speed 404 vs Custom 404 Error Page