Contacts is unresponsive for about a minute (or more) after starting
I'm using Gnome Contacts 3.28.1 on Linux Mint 19.3 and consistently experience Contacts being unresponsive for about a minute after it starts. The window is fully visible, but it contains no contacts and cannot be moved. After about a minute, the Contacts is fully responsive and works as expected. I have never had a problem with it from this point onward.
I'm not sure what else to add to help with debugging it, except for my kernel details, which are: "4.15.0-88-generic #88 (closed)-Ubuntu SMP x86_64 GNU/Linux". If you need any further information, please let me know and I'll do my best to add it.