Hello, Alex,
“since the changes you made” – what exactly?
Please update the theme and Core plugin – https://xstore.helpscoutdocs.com/article/63-theme-update https://xstore.helpscoutdocs.com/article/37-plugins-update
Then record a video of your actions and the speed on your site, please.
Thank you for your cooperation. We apologize for any inconvenience this may have caused.
Kind Regards,
8theme team