I see you tagged one of my posts, but the one that will most help you is:
Bottom line: Yes you can turn off dynamic image resizing, and you can also turn off all dynamic video transcoding as well. If you are running a NAS with limited CPU power and you know the format of your media is compatible with your devices, you absolutely should do this.
Trumpy and I have gotten into it before on this topic (hi again!) and while I don’t want to be hostile on a public board or rehash old issues, I do need to say that he’s 100% wrong about this. Image resizing is not the same as video transcoding. A large .jpg is not the same as 4K video. Devices do not need to have images resized to display them (as they might for very high-resolution video). You absolutely can view your native images.
The answer is to add a custom profile to
/Plex/Library/Application Support/Plex Media Server/Profiles
In the post above, I offer a very basic, slimmed down custom profile that blocks all transcoding on all devices for mkv, mp4, mp3, jpg, gif, png and webp files. It just delivers the file. If you do have incompatible files, Plex won’t step in to transcode for you, but if all your files are compatible you’ll be fine. It’s saved me and allows me, for the first time, to use Plex for still images.
