All plugins are beeing scanned when they are new, or a new version is detected. Once scanned, the information is stored in some file. Whenever Cuabse starts, it “scans” all plugins and compares the existing version with the stored information; this is usually done in microseconds, but “scanning xxx” is always displayed to inform the user. Vst Connect/Transit are probably the last beeing “scanned”, so in the splash box the last one remains displayed while the next loading task is beeing performed and its result is displayed, which may take a while. Long story short: scanning VST Connect or VST Transit takes just as much time as any other plugin that has been scanned before - which is close to nothing.