Since Sozi 19.04, a lot of internal changes have been made to Sozi: code clean-up and refactoring, upgrade of Electron and JavaScript libraries, build process. These changes should be transparent for users.
Most changes have already been mentioned in the release notes for version 20.03-beta. In Sozi 20.05, translations have been updated and a few last issues have been fixed.
Sozi-export
Sozi-export is a set of command-line tools that convert Sozi presentations to videos or printable documents.
Video export was very slow for frames with a long timeout. This is fixed in Sozi-export 20.04.