Hello,

1. Try to use this code in Theme Options > Custom CSS > Custom CSS for mobile:

.banner.hover-fade img {
  height: 200px;
}
.banner .banner-content p {
    width: 320px;
    font-size: 13px !important;
}

2. I’ve edited your code in custom.css file to:

@media (min-width: 1200px){.home #owl-testimonials .row:first-child{
    width: 900px;
    float: left;
}
.home #owl-testimonials .row:last-child{
    width: 300px;
    float: right;
}
#owl-testimonials .row:first-child .quote{
    width: 32.333333%;
}
#quote-15210{
width: 100%;
}

/* testimonials*/

blockquote.testimonials-text{
    height: 370px;
}}

Please check testimonials now.

3. Use this code in Theme Options > Custom CSS > Custom CSS for mobile:

.banner img {
    height: 200px;
}

Best regards,
Jack Richardson.

Hello,

You forgot to provide your site name.

Best regards,
Jack Richardson.

Hello,

We can’t access your site. The error is “This webpage is not available”.
Please check if you spelled domain name correctly.

Best regards,
Jack Richardson.

Hello,

Please provide us with the screenshots and links to the products where you see the problem. Also give us WP Dashboard and FTP credentials in private content.

Best regards,
Jack Richardson.

Hello,

I’ve edited the code to this one:

tr.tax-rate td {
   text-align: right !important;
}

Please check now.

Best regards,
Jack Richardson.

Hello,

You’re welcome.

Best regards,
Jack Richardson.

Hello,

I’ve added this code in Theme Options > Custom CSS > Custom CSS for mobile:

.page-heading-slider {
    display: flex;
}

Please check home page on mobile now.

Best regards,
Jack Richardson.

Hello,

You’re welcome.

Best regards,
Jack Richardson.

Hello,

Sorry, but I don’t see such issue:
http://storage5.static.itmages.com/i/15/1009/h_1444388728_4403260_a9d4214b21.png

What browser are you checking in?
Try to check it in another one.

Best regards,
Jack Richardson.

Hello,

I’ve checked WP Dashboard and it’s working quite fast.
Try to check it in another browser and activate default WordPress theme. Does the issue persist there too?

Best regards,
Jack Richardson.

Hello,

Please provide us with FTP credentials.

Best regards,
Jack Richardson.

Hello,

I enabled “Optiomized JS” and “Optiomized CSS” options in Ultimate > Modules > Scripts and Styles tab.

Best regards,
Jack Richardson.

Hello,

Please add this code in Global Custom CSS:

.wcmp-product .wcmp-product-image .wcmp-onsale.wcmp-sale-circle .onsale {
   padding: 30px 5px !important;
}

Best regards,
Jack Richardson.

Hello,

You’re welcome.

Best regards,
Jack Richardson.

Hello,

You can try solutions described in the articles:
http://www.wpbeginner.com/wp-themes/how-to-add-facebook-open-graph-meta-data-in-wordpress-themes/
https://www.elegantthemes.com/blog/tips-tricks/how-to-add-open-graph-tags-to-wordpress

Best regards,
Jack Richardson.