Can I take a wild guess that you're using Firefox? I have noticed Firefox performance is much worse than any other browser. I think this is due to issues in the Angular and Material components being used.

As stated in the big red notice in the website, the software is currently in alpha preview. Given time, Bitmagnet will be trying to mitigate the Firefox performance issues (the <5% market share means it's prioritised accordingly), but it's important that users of all browsers can have acceptable experience in the app.