Take my apologies for the delay in answering.
If your site works sometimes slow, sometimes fast then the issue is not related to the theme and you need to contact your hosting provider to check it in more detail.
To remove the shop banner go to Theme Options > WooCommerce > Shop > Shop page layout > remove static block shortcode from the Shop banners content filed.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.