I checked your site. I see the homepage have larger slider images. Maybe it affect to page load speed. Please try to reduce the banner image file size. Then enable merge & compress js, css in venus theme control panel in admin. Enable caching in admin > System > Cache management.
Please provide me the site information (admin and FTP account) if you can not do it to speedup the site.
Answer for Home page of ves sunstyle Magento template is very slow