Hello,
Sorry for the delay.
1. Go to Appearance > Themes > install and activate Storefront theme – official WC theme and check if you have this issue with our theme only or even with official theme too.
2. Please update Ultimate Addons for Visual Composer and WPBakery Visual Composer https://www.8theme.com/download-plugins/page/2/
3. Please take our apologies but we don’t provide support for 3rd-party plugins http://prnt.sc/f6hayc.
4. The most important part of optimizing your site is caching. We recommend using W3 Total Cache. Read the beginners guide to setting up W3 Total Cache plugin https://premium.wpmudev.org/blog/w3-total-cache-settings/
Also, optimize images. Please read how to do this:
http://premium.wpmudev.org/blog/10-best-image-optimization-plugins-to-speed-up-your-wordpress-site/
http://www.elegantthemes.com/blog/tips-tricks/optimize-images-for-your-wordpress-website
Please check this report https://gtmetrix.com/reports/www.faisalfabrics.pk/k2W3Ewgq and follow the recommendations from there.
Regards,
Rose Tyler.