Hi @core365,
The slider will always load with a delay as it needs to download the resources and dependencies for it to work.
Instead, what you can do is achieve it through Darshana’s recommendation plus a bit of custom CSS. Example, make sure to add the background color to the upper layer (it will serve as a placeholder, it doesn’t matter what color you choose). Then add this CSS to your section or row’s Element CSS.
$el .x-bg-layer-upper-color {
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#000000+0,000000+100&1+0,0+54 */
background: -moz-linear-gradient(top, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 54%, rgba(0,0,0,0) 100%) !important; /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(0,0,0,1) 0%,rgba(0,0,0,0) 54%,rgba(0,0,0,0) 100%) !important; /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, rgba(0,0,0,1) 0%,rgba(0,0,0,0) 54%,rgba(0,0,0,0) 100%) !important; /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#000000', endColorstr='#00000000',GradientType=0 ) !important; /* IE6-9 */
}
I use this tool to create that gradient style, http://www.colorzilla.com/gradient-editor/. Then I just added !important to make sure it overrides the color you have added through the inspector.

Thanks!