Generate Trickplay Images takes an order of magnitude longer than Plex

[akanar]

I have Plex and Jellyfin on the same docker host with the same resource limits. To generate these images Plex takes about 1-2 weeks. Jellyfin on the other hand has been generating them for 3-4 weeks at this point and is only at 11.6%. I do not see any errors in logs and seems everything is working normally. I also see very little CPU utilization. Only a single thread at 100%.

Is Jellyfins generation of these images seriously just 1 video at a time and that process is limited to just a single thread or do I have something configured wrong?