Problem - Site super slowly - version too old for woocommerce

Since when I’d Import the Demo Data the website and the backend too, is ridiculously slow much slow!

How can I solve it?

Then I have this message how can I resolve it? :

Your theme (Emprise Child) contains outdated copies of some WooCommerce template files. You may need to update these files to ensure compatibility with the current version of WooCommerce. Fixing Tips:

Update your theme to the latest version. If no update is available, please contact the theme author to inquire about compatibility with the current WooCommerce version. If you copied a template file to change something, then you’ll need to copy the new version of the template and reapply the changes.

Hi, We are unable to upload demo, would you please guide how you uploaded demo, xml file is missing

Please check PM and respond to that. Thank you.