Basecamp freezes constantly

Hi,

I downloaded Basecamp and when I run it, it is basically unusable. The UI freezes constantly for around 20  seconds then it becomes responsive for 1s and and then again unresponsive. 

I have the latest version of Catalina and the latest version of Basecamp (from the AppStore).

Was this app ever tested on macOS? I see many other users with issues.

cheers