Would love help with this too, 7.1 is a bit jerky. Using Fullscreen Slideshow Reel. Tried this code from another post I found, but doesn't seem to be working. Here's my site, slideshow at the bottom of homepage: https://demo-ashland-template.squarespace.com/
gallery-fullscreen-slideshow-item-img{
transition: opacity 2000ms ease-in-out !important;
-webkit-transition: opacity 2000ms ease-in-out !important;
-ms-transition: opacity 2000ms ease-in-out !important;
-moz-transition: opacity 2000ms ease-in-out !important;
-o-transition: opacity 2000ms ease-in-out !important;
}
//.gallery-fullscreen-slideshow[data-transition="fade"]
.gallery-fullscreen-slideshow-item[data-active="true"] .gallery-fullscreen-slideshow-item-src{
transition: opacity 2000ms ease-in-out !important;
-webkit-transition: opacity 2000ms ease-in-out !important;
-ms-transition: opacity 2000ms ease-in-out !important;
-moz-transition: opacity 2000ms ease-in-out !important;
-o-transition: opacity 2000ms ease-in-out !important;
}