since version 6 LibreOffice starts very slowly on my Windows machine. When I start office I see the splash screen almost immediately and the progress bar hits 100% quickly. Then I have to wait almost 20 seconds until the splash screen disappears and the application windows appears.
I had this with all versions starting with 6 – currently 126.96.36.199 and also latest daily of 7.0.1.
I initially suspected some network related issues – like querying printer states. But couldn’t monitor any network traffic of interest. I also tried resetting the profile using safe mode.