I replied in the other topic. Confirm that you added qos=false to the pipeline.
It should look something like this:
if (strcmp(cmd_name, "gst_loopback") == 0)
pipe_proc = "decodebin ! autovideoconvert ! "
"video/x-raw,format=I420 ! identity drop-allocation=true !"
"v4l2sink device=/dev/video0 qos=false sync=false";
Also, you may be using software rendering, not hardware accelerated rendering. Post info on your GPU setup and also if you are using decodebin or nvdec.
You can also more questions, but just to let you know that there’s a bunch of information in the doc available here https://theta360.guide/special/linuxstreaming/ and there is search capability on that document.
Again, no problem if you keep asking questions. Just trying to help you out.