Guide: Running Jellyfin in Synology's DSM 7 Using Docker Compose

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As a first-run -- for ANY install -- I would recommend looking at the scheduled tasks and setting them for low-traffic times. As @Efficient_Good_5784 pointed out, you can get some pretty significant degradation (particularly for remote users, anybody who requires transcoding, etc...) during some of these scheduled tasks. The Library scan doesn't seem to cause a lot of problems, but refreshing People (i.e., actor info, images, etc...) has always caused a lot of network congestion for me. Instead of every X hours, set them for a specific time as the trigger and make sure it's when none of your users (or you) are likely to be on.

I'd advocate adding this to the official documentation as a post-install step, honestly. Even on well-equipped devices, these tasks can take a toll on performance.