I've flagged the title; it is incredibly poor etiquette to sneak half a gig in downloads on a user, especially when demonstrating something for mobile!
No, don’t put it in the title, just fix the page. A page being even 100MB would be wildly unacceptable, let alone 450MB.
The really quick fix is just to replace the images with links to the images. Anything fancier (like replacing them with static images and links to actual videos rather than GIFs) can come later.
Please. I’m not trying to be mean in any way, but words are failing me at just how bad this is. You just don’t do this sort of thing. Entirely genuinely, you have probably directly cost at least a dozen people a few dollars with these GIFs, and measurably (sometimes seriously) inconvenienced dozens more for up to a month due to limits reached or approached.