Oh don't you dare! Run an a/b test first, before you disable autoplay. If autoplay gets more signups then keep it. You're not here to be our friend and drink tea, you're running a business.
From a design point of view, I LOVE your desaturated forest look with the logo. It's all very memorable
I know what you mean though. I have chrome plugins installed that prevent autoplay, flash, widgets, facebook, and a whole lot of other things. It's awesome I can have 40+ tabs open and not have to worry about lag.