If you find that it's laggy on Firefox, make sure you are on at least 44.0.1 (latest stable at the time of the post). Strangely I don't see anything that would feasibly affect this in the 44.0.1 changelog, so maybe the browser restart fixed it.

This is an implementation issue about react-designer renderer. I'll implement custom renderer for instant dom updates. Virtual DOM is not efficient to handle this.

Thank for your feedback, I'll try to fix it.

Holy fuck, this is cool.

We've actually been thinking about this exact problem recently and were considering building something like this. This should prove a great proof of concept / starting point for our work.

Awesome.

It is laggy even on Chrome. React is not necessarily the best tool if you are looking for for smooth transitions.

Yep, you're right. Virtual DOM abstraction is not good for smooth transitions. I'll implement reflectDOM method for every object type. Thanks for your feedback!

What do you mean by "reflectDOM method"? Can you explain a little bit how will you deal with this? I've searched the repo but couldn't find anything regarding reflect. Thanks!

Making smooth transitions is really hard with React's Virtual DOM implementation. Because in every state update, the VirtualDOM abstraction calculates something between DOM and State. Instead of, I'll update (reflect) objects manually while the user dragging objects instantly.