Clean way to do this is with a service unit override.
1. Stop emby and restore the original unit file.
service emby-server stop
2. Verify that the unit file has the original ExecStart command:
systemctl show emby-server |grep ExecStart
3. Create a unit override to add the Nice parameter. This will open an editor where you can add Nice=-5 to the service block.
systemctl edit emby-server
Add:
[Service] Nice=-204. Exit and save the override file. Y and enter for the prompts.
5. Start the Emby server. And run top/htop to verify the new nice value.
service emby-server start
Source: Emby forums
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