Hi!
Sorry I was on the go and didn't spend the proper time to support my comment. I've coded a fast Pen for you to replicate the performance issue. I've made 2 versions: one with GSAP, one with CSS animations only.
https://codepen.io/LuBre/pen/yLyapGW
Chrome = butter-smooth
Firefox = little stutters
Edge = little stutters unless you add "rotation: 0.01" option in tl1
And here's the same-exact animation without GSAP (css animations only). It doesn't run as butter-smooth as GSAP but it runs perfectly fine across all browsers (link removed to avoid double-codepen issues here on the forum).
codepen.io/LuBre/pen/GRgjyEm
What do you think about this stuff? Let's dig into it, I love GSAP and I want to explore all the possible avenues
### EDIT ###
I've reduced the code to the most simple thing ever. No images, no fading, just the text translation. It still doesn't run smooth on Firefox/IE:
codepen.io/LuBre/pen/PowGQby