Hello @photomaldives,
The error message you’re seeing indicates that there is a JavaScript issue in the siteground-optimizer-combined-js-1234.js file, specifically at line 185. The error suggests that the script is attempting to call the slice method on an undefined variable.
What I can recommend in this case would be to check if the Speed Optimizer plugin is up-to-date and if not – make sure to update it. Also, make sure that there are no other caching plugins enabled that may use the same functions/methods and interfere with the proper work of the Speed Optimizer plugin.
If this does not help – it would be best to post a ticket to our support team from your SiteGround Client Area. This way, they would be able to check the issue in detail.
Best regards,
Daniela Ivanova