Thanks for reaching out! I'm sorry that you are experiencing trouble with this. Sometimes issues like this are related to the internet connection and web browser you are using. Would you mind trying a few quick steps for us?
1. Make sure you're on a fast, reliable internet connection.
2. Make sure you're using the most recent version of your browser. We recommend Google Chrome for optimal performance.
3. Try browsing in a Chrome Incognito window. This will disable your extensions and cookies, which often improves performance.
4. Try turning off WebGL. This can be done by going to View > Use WebGL and un-selecting this option.
If these steps don't help, I'll be happy to troubleshoot further, and would appreciate it if you'd submit a support ticket so that I can get more information from you.