Mine's been running for about 5-6 days now, also not a huge library. I'm running Jellyfin in an LXC container on a host with 16 CPU cores. Started with 4 cores, but have bumped it up to 8. I have noticed that when it is generating the Trickplay images for h.264 content it only uses about 8% of the available CPU resources. When generating images for x265 it uses about 60-70%.It doesn't seem to matter what the priority for the trickplay job is set to.