How to Transcode with Low-Power CPUs on Plex and NAS

Why Transcoding Slows Down NAS Systems

Plex is one of the most popular media server platforms. Many people run it directly on a NAS to store and stream their media in one place. But transcoding is where most NAS systems have trouble, especially those with low-power CPUs. These processors are not meant for heavy real-time video conversion; they are meant to be efficient and reliable.

Transcoding happens when a media file needs to be changed on the fly to fit the format, resolution, or bitrate of a client device. Users may have to wait for buffering, playback failures, or lower quality if the NAS CPU can’t keep up.

To keep your NAS running smoothly while you back up and store data, you need to know how to properly manage Plex transcoding.

Learn the Difference Between Direct Play and Transcoding

The best way to ease the strain on your CPU is to not transcode at all.

Play Direct

Direct Play means that the client device can play the media file exactly as it is stored. There is no need to convert, which uses very little CPU.

Direct Stream

Direct Stream changes the container but leaves the video and audio streams alone. Compared to full transcoding, CPU usage is still low.

Full transcoding

Full transcoding changes either video, audio, or both. This process uses a lot of CPU power, which is why low-power NAS systems often have performance problems.

Optimizing Plex to prefer For low-power CPUs, Direct Play is the most important thing to do.

Why Plex is hard for low-power NAS CPUs

Most entry-level and mid-range NAS units use CPUs that are best for:

Serving files
Backup and copying
Uses little energy
Always reliable

They aren’t made for encoding video in real time. A low-power CPU can be completely used up by a single 1080p transcode, and 4K transcoding may not be possible without hardware acceleration.

When Plex takes up all of the CPU’s resources, it can have an effect on:

Speed of file access
Jobs for backups
Tasks for snapshots and replication
The system’s overall responsiveness

This makes it very important to have the right transcoding strategy.

The best ways to deal with Plex transcoding on NAS

Set up media formats in advance

Pre-optimizing media files means that real-time transcoding is not necessary. If you convert videos to formats like H.264 or H.265 that most devices can play, along with audio tracks that work with them, most devices will be able to Direct Play the content.

This method moves processing away from the NAS, which makes playback more reliable.

If possible, turn on hardware transcoding

Some NAS platforms can use built-in GPUs to help with hardware-assisted transcoding. When it’s available and set up correctly, hardware transcoding cuts down on CPU usage by a lot.

But there are some problems with hardware transcoding:

Not all codecs work
Settings for quality may be limited.
Needs the right settings for Plex and NAS

It should still be used carefully, even with hardware support.

Set a limit on the quality of Plex transcoding

Lowering the maximum streaming resolution or bitrate in Plex settings makes the CPU work less. This is especially helpful for streaming from a distance, where quality is already limited by bandwidth.

Setting reasonable defaults can help keep the CPU from getting too busy during peak times.

Limit Simultaneous Transcodes

By limiting the number of concurrent streams, you can keep a single NAS from getting too busy. This is especially important in homes or offices where more than one person uses Plex at the same time.

Access controls and user profiles help set expectations and keep track of performance.

Move Plex to a Different System

In some situations, the best way to solve the problem is to split up the roles:

NAS takes care of backups and storage.
A separate system does the Plex transcoding.

This keeps the NAS reliable while allowing for high-quality streaming.

Things to think about for the network and the client

A lot of transcoding problems start on the client side. Devices that work with modern codecs and higher bitrates make conversion less necessary. Strong wired or high-quality Wi-Fi connections also cut down on unnecessary transcoding that happens when there isn’t enough bandwidth.

It’s often more helpful to match the client’s capabilities to the media format than to upgrade the NAS hardware.

Finding a balance between streaming media and backup and storage tasks

A NAS that runs Plex is often also in charge of:

Backups that happen automatically
Keeping snapshots
Syncing with the cloud
Sharing files

Letting Plex use up all of the system’s resources raises the risk. Scheduling backups for times when media use is low and putting storage services first make sure that data protection tasks are never put off.

This balance is very important in a business setting or a home office that is also a business.

When it’s a good idea to upgrade your NAS

If transcoding is still a must, you should upgrade to a NAS that has:

More powerful CPU
Support for transcoding hardware
More memory

might be okay. But upgrading just for Plex without fixing format optimization or client compatibility can be a waste of money.

A strategic approach works better than just upgrading hardware.

About the company Epis Technology

Epis Technology offers businesses and advanced home environments enterprise IT infrastructure, data protection, and Synology consulting services. The company helps clients design NAS architectures that strike a balance between streaming media, reliable backups, and better performance. Epis Technology makes sure that Plex and NAS environments run smoothly without putting data security or long-term system stability at risk. They are experts in Synology deployment, large storage solutions, and system tuning.