It optimizes the database which causes a lock. Nothing else can access or make changes to the db while it’s locked which means Plex “hangs” until the optimize is complete.
It’s likely just slow due to size / performance of your system. Maybe look as at adding or removing libraries during off hours. Sorry I can’t be of more help.
i mean i have the most maxed out system possible… can transcode 20 films at once… but adding or deleting a library on plex… brings the machine to its knees like nunayour business/totally locks it up/boots everyone off : ) : (
emby doesn’t have this problem/does this… just seems like a design flaw somewhere…