Bought new 12700K CPU bit Hybrid only utilizes 20 percent of it

[Selur]

What is unclear about what I wrote?

Create a file with the Vapoursynth script that would be used during encoding and test how fast that would be processed.To do this you would (before creating the job for processing) look at the Vapoursynth Preview (to make sure any used indexing file exists and to check that the script works) and the Vapoursynth Script Preview. Then you would create a test.vpy file with the content of the script shown in the Vapoursynth Script Preview and call:"PATH TO HYBRID/64bit/Vapoursynth/VSPipe.exe" -p "PATH to the test.vpy" NUL in a Windows Command Line prompt.This will do the decoding and filtering of the source without the decoding.While the decoding is running check the cpu utilisation.If the utilisation is low then the used script is the issue. (which is either the fault of one of the filters used, the source filter or the script can't get the source faster)
If the utlilisation is high the speed you see is the max speed you can get and the bottleneck is the encoder.