Massive disk space usage

Hello @swinggraphics,

the issue is generally caused by some dynamically generated CSS/JS files that are forcing the re-generation of the CSS/JS combination file on every request. When this happens, the culprit should be identified and excluded from the CSS/JS combination functionality in our plugin. The following filters can be used as well:

add_filter( 'sgo_css_combine_exclude', 'css_combine_exclude' );
function css_combine_exclude( $exclude_list ) {
  // Add the style handle to exclude list.
  $exclude_list[] = 'style-handle';
  $exclude_list[] = 'style-handle-2';

  return $exclude_list;
}

add_filter( 'sgo_javascript_combine_exclude', 'js_combine_exclude' );
function js_combine_exclude( $exclude_list ) {
  $exclude_list[] = 'script-handle';
  $exclude_list[] = 'script-handle-2';

  return $exclude_list;
}

More information regarding the custom filters can be found here:
https://www.siteground.com/tutorials/wordpress/speed-optimizer/custom-filters/

Also, there is a cron event that should clear the siteground-optimizer-assets folder once a day if exceeds 1000MB. The cron event is called
siteground_optimizer_check_assets_dir
so you can check if this event is scheduled correctly.

If none of the above works for you and your site is hosted at SiteGround, you can open a support ticket and our support team will help you identifying the cause of the issue.

In the case of this site, CSS and JS minification and combination are disabled.

I installed WP Crontrol to investigate the cron events. I deactivated and reactivated Speed Optimizer. “siteground_optimizer_check_assets_dir” is not in the list.

I will explore the cache directory next time and try to discern what is taking up so much space, but it definitely would be great if it purged once a day with the cron event.

BTW your File Manger has a bug where it cannot browse some of these directories. Screenshot of the File Manager trying to load endlessly and the contents of the directory in FTP: https://imgur.com/a/6PnSvFd