Performace tweaks
Database cache size
Sets the amount of data that the database will hold in memory at once, per database file. A larger value may help improve Emby Server performance. Requires a server restart to take effect.
If you have the available RAM you should set the database cache size to 1.5 to 2 times your library.db size.
Navigate to your platform Emby programdata folder and look in the data folder to see its size.
You can find your server info on the dashboa