NVENCC64: How to make it encode faster? It only uses 5% of the GPU

[yoeymeme]

The title explains it, NVENCC64 is encoding really slow with only a small GPU Usage,

This is my current .bat script:

"NVEncC64 -i "avisynth.avs" -o "output.mp4" --preset P1 --codec hevc --vbrhq 3500 --audio-codec libmp3lame"

P1 is Performance and higher numbers indicate higher quality

[pandy]

Avisynth can be limitation - if your avs script is slow then don't expect fast encoding.

[jagabo]

Be sure to use a multithreaded build of AviSynth (for example, AviSynth+), and enable multithreading.

[sophisticles]

Nvenc, under normal circumstances, uses a built in dedicated chip for most parts of encoding and decoding, with only a small portion of the calculations taking place on the GPU, so low GPU utilization is to be expected.

The only exception is for encode of RGB content, then the entire encode is done on the GPU with no help from the dedicated chip.