That seemed to help a little with the glitchyness. I was worried that the size of the images and the nature of the tween would cause some issues, hopefully I can find a way to rework it in the future. When I get a chance I will see if I can replicate it in a codepen instance.
I am currently building a website that utilizes gsap js and scrollmagic to create a parallax effect. It works perfectly in most browsers and I even got it to be responsive. However I noticed an issue with Safari 6 on Mac OSX where the animation still 'technically' works but is extremely glitchy. You can see what I mean here: http://adm-rhino.unl.edu:82/why-college/ Any ideas on a solution or where the problem stems from would be a great help.