Best environment and settings for Jellyfin Player on old i7 CPU (HD 4600))

[TheDreadPirate]

The 4765T does not have any HEVC decoding capability, so the CPU has to all the heavy lifting if you aren't transcoding to H264.

I'd need to see your jellyfin logs to figure out what is actually going on on the server side.

As for setting the audio to 5.1, the JMP client is likely also downmixing the audio locally when set to stereo. Straining an already strained CPU.

Firefox may be handling things better because the server is transcoding everything server side and Firefox is just playing the video.