I'm using a theme called Hatch Pro, which is a gallery based theme and the index page displays the posts using the featured image. You can see it here.
On slower browser environments, the images sort of load in a jumpy manner. In this situation, I'd like them to load with a smoother transition (see example) or preload, so they all are ensured to appear at the same time. The theme author mentioned Lazy Load, but I'm not sure how I would implement that and would welcome any direction. I don't necessarily need them all to load at the same time (as the list of posts will continue to grow), but at least the images being viewed on the screen at the time of loading.
I'm comfortable with CSS, but very novice with PHP or other heavier coding.