Hello,
1) By default, there is no multi-currency functionality in WC or in the theme. You can try https://wordpress.org/plugins/currency-switcher-woocommerce/ or https://wordpress.org/plugins/wc-multi-currency/ or similar. 2) Provide temporary wp-admin and FTP access, so we can take a closer look. 3) Sales Booster will be fixed in the next update of the theme. It will be released soon. Right now, temporarily disable it. 4) WooCommerce > Settings > Products > Enable product reviews Theme Options > WooCommerce > Single product page > Tabs > Reviews Position 5) https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
Regards
