Hi, my name is Matt and I can help you (23 years an IT developer and a webmaster, scripting web animations/visualizations for last 5+ years).
Please provide more details. Maybe you even need usual (and faster) animation for which I use GreenSock library.
Proof of knowledge on request in private message. I assume you require v4 of D3.js that I have grasped a lot though a lot of sites still use common version 3.
Looking forward to your reply,
Matt