Plex on Synology NAS lagging on some movies but not all

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On some of my movies they will load slowly and the frequently lag for long periods of time. In these cases, the NAS cpu will show between 97 & 100%. On others They will play smoothly with the NAS cpu between 10 and 20%. Type of movie (ie, mp4 or mkv) doesn’t seem to make a difference. I’m new to this and pulling my hair out! NAS is a Synology 418 with 4, 4TB seagate NAS drives. Any help very much appreciated!!

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