Hi @pnarsipur, thanks for posting in the Lucid Community! It’s possible WebGL might be causing an issue with the graphics card on your computer. Can you try toggling WebGL off? This can be done by selecting View > Rendering > Use WebGL and un-selecting this option. For help with disabling WebGL, please see the below Community post (in English).
If that does not resolve the issue, could you try opening your document in a private or incognito window to help us narrow down the potential cause? Could you also try connecting to a different network or disconnecting from your VPN (if applicable)? Sometimes account performance issues can be related to internet security/speed or browser issues. These steps will help us eliminate that possibility. For help with opening an incognito window, please see the below Community Post (in English).
I appreciate your help and patience!