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Find out whether Plex is transcoding
Plex can play a file directly, convert only its container, or transcode media to meet the client’s capabilities and playback settings. A file that works on one device may need conversion on another. Container, codecs, resolution, bitrate, subtitle compatibility, requested quality, and remote bandwidth can all affect the playback path. Plex explains the differences in its Direct Play, Direct Stream and Transcoding guidance.
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Check what is happening during playback rather than assuming every stream is a transcode. When practical, use a client and media format that support Direct Play or Direct Stream. Subtitles deserve particular attention: an incompatible subtitle format can trigger a video transcode even when the audio, video, and container would otherwise be compatible. Plex’s streaming media guidance describes these playback modes and compatibility factors.
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Leave transcoder quality on Automatic
Plex recommends Automatic transcoder quality for most users. In Plex Web, open Settings > Server > Transcoder and check the current setting. Avoid changing quality settings in an attempt to solve contention before you know which streams are being converted.
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Bound simultaneous video transcodes
The Transcoder settings also include a maximum number of simultaneous video transcodes. A limit can prevent conversion jobs from multiplying when the NAS is busy with backups or other services. Choose a conservative ceiling based on the streams your household actually needs and the NAS’s behavior under load—not a number borrowed from another model. Plex documents the setting in its transcoder configuration guidance.
Consider hardware acceleration only if your NAS supports it
Hardware acceleration can reduce the processing burden of transcoding and may allow more streams, but it is not a universal NAS setting. Confirm that the exact NAS hardware and software combination is supported before enabling it; the NAS brand alone does not establish compatibility. Plex also warns that hardware-accelerated output can have quality or compatibility trade-offs in some cases. Its hardware-accelerated streaming documentation covers requirements and setup.
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Hardware-accelerated streaming generally requires a Plex Pass for the server owner, subject to Plex’s stated exceptions for particular devices. Check the current eligibility and compatibility details before planning around acceleration.
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Schedule backups and integrity checks around viewing
Use observed runtimes to choose a backup window
For Synology Hyper Backup, schedule slow tasks during off-peak hours where possible. Use previous task durations to leave enough time for each job, and account for other scheduled NAS work. Synology recommends off-peak scheduling and troubleshooting slow tasks in its Hyper Backup troubleshooting guidance.
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Keep an integrity check from colliding with a scheduled backup
Synology documents that a scheduled Hyper Backup task may wait up to three hours behind an integrity check before the scheduled task is skipped. That timeout describes the cited Hyper Backup behavior; it is not a general rule for other backup software. Give the integrity check its own window, separate from the backup task, and allow enough time for both based on their observed runtimes. See Synology’s Hyper Backup documentation.
Other backup jobs may queue and run sequentially. Stagger them rather than assuming that overlapping schedules will run concurrently or finish on time.
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Measure the combined workload and tune it
Use DSM Resource Monitor to inspect CPU, memory, network, and storage while Plex is playing representative media and while the backup window is active. Synology recommends identifying the service or process responsible when CPU utilization is extremely high; a high reading alone does not identify the cause. Its Resource Monitor documentation explains the monitoring tools.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems- Test typical playback. Include the client devices and media types that are most likely to trigger conversion, including subtitle use and remote playback if relevant.
- Observe a backup window. Note whether playback, backup completion, or other NAS services are affected, and record how long each task takes.
- Change one workload lever at a time. Move the backup window, separate integrity checks, stagger backup jobs, lower the simultaneous video-transcode limit, or reduce avoidable transcodes by improving client and media compatibility.
- Observe again. Keep the changes that improve responsiveness without preventing the playback and backup work you need.
The monitoring approach matters because Plex processing needs vary with media and client, and the cited guidance does not establish a universal CPU threshold, safe transcode count, or ideal schedule for every NAS.
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Choose the adjustment that matches the symptom
| What you observe | What to check or change |
|---|---|
| Playback slows only for some files or clients | Check whether those sessions transcode; review codec, container, requested quality, remote bandwidth, and subtitle compatibility. Prefer Direct Play or Direct Stream where practical. |
| Playback slows when several conversions overlap | Set a more conservative simultaneous video-transcode limit and reassess with representative streams. |
| Playback suffers during a backup window | Move or stagger backup work outside expected viewing peaks, using measured task runtimes. |
| A scheduled Hyper Backup task is skipped after an integrity check | Give the integrity check and backup separate schedule windows; the documented wait-before-skip behavior is specific to Synology Hyper Backup. |
| CPU remains heavily loaded despite fewer transcodes | Use DSM Resource Monitor to identify the service or process creating the load, then adjust the relevant workload rather than assuming Plex is the only cause. |
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