Fade in and out on click

I saw that this question is out there but wasn't answered. When I click a thumbnail on my index page, everything jolts down in a glitchy kind of way before loading the next page. I simply want the pages/ thumbs to fade in and fade out so it's a more smooth experience.  I can't seem to find those options.  I see you can animate individual image blocks, but not my index page/ thumbnails.  Seems pretty simple. 

Or if noone can answer this can you at least tell me why my pages "shutter" and twitch in clicking out of them?

Maybe my images are too large.

Just curious anyone's thoughts.