1. Shella - Premium Fashion Prestashop Theme
Shella is a premium and unique fashion Prestashop theme. Our team puts years of web development experience into Shella template. It includes same features as other themes at themeforest, plus some unique features which you can find only at Shella template.
Some time, after installed the theme, the mobile menu is not visible in front-end. It's because of the JMS mega menu module was not added to displayTopColumn hook.
Please follow this instruction below, then the problem will be fixed:
Sometime you dont know why your prestashop site run very slow, may be this tip will help you. When you use prestashop default version it has more unused modules/blocks but source of them (javascrip/css) still loaded on frontend, because unused modules assigned to header Hook.