Hello @mattdss
It may indeed occur that the “siteground-optimizer-assets” folder becomes notably large. This typically results from the accumulation of numerous minified and/or combined CSS/JS files. Often, this is due to a plugin or a theme setting that appends a timestamp to your CSS or Javascript files with each website visit, thereby generating a new cache file each time the website is accessed.
Normally, the contents of the public_html/wp-content/uploads/siteground-optimizer-assets/ folder should be automatically cleared when the SG cache is purged through the admin area of the application, which should reduce the folder’s size. Since you are reporting that this does not seem to be happening in your case, I kindly suggest that you submit a Helpdesk request through your SiteGround account, so that our technical team can review the case, investigate, and provide further information.
Best regards,
Stefan Stefanov