Thanks for posting, and I'm sorry for the trouble!
Can you please try the following:
1. Open the document in a private or incognito window, as sometimes document performance issues can be related to browser issues.
2. 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, please fill out a support form and include the following information:
1. A screenshot of the issue that is happening.
2. The URL to your document.
Thanks in advance for your help and patience!