SOLVED: Tracking/Starting Slow

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Any idea exactly which processor you have? The Synology site only says Intel Celeron 2.0 GHz and the only matching quad-core CPU I could find was a J1900. Looking at the Intel QSV support, the Celeron processors in the Haswell generation are not particularly capable and explicitly do not support HEVC at all. So what's happening is that folks are starting media playback and your older machine is decoding and encoding the media on the CPU without any hardware acceleration.

See: https://en.wikipedia.org/wiki/Intel_Quic...%20support

ETA: If you provide your ffmpeg logs via pastebin, we can take a look (Dashboard > Logs and look for ffmpeg in the log name). I would guess it's transcoding *extremely* slowly.