I've had this problem since LO 5.x across multiple Macs:
Build ID: 057fc023c990d676a43019934386b85b21a9ee99
CPU threads: 12; OS: Mac OS X 10.14.6; UI render: default; VCL: osx;
Locale: nb-NO (en_NO.UTF-8); UI-Language: en-US
2018 MBP lots of CPU and RAM
diskimages-helper is 100% for 5+ minutes trying to verify LibreOffice.app when I perform an installation
This gives a poor first impression for users and is very inconvenient if I want to try out new versions to see if bugs have been fixed.
I know that I can (temporarily) disable Gatekeeper or other workarounds, but this is not recommended.
I have tried searching the bugzilla bug reports, but have not found any duplicates.
Confirming. It has indeed been this way for a very long time...
It is even longer if the xattr quarantine property has been set by Gatekeeper, see for example bug 97530.