Not all 8 XEON are used under Premiere CC 2019

Hi everyone,

I have my new laptop Dell 7540 - Xeon 8/16 E-2286M - IGP 630 - Quadro RTX3000 6GB - 32GB DDR4 - SSD1To - Win10Pro - CC 2019

When I export 3min UHD 30P 4.2.0 8Bit 100MB  => NVenc H264 35MB CBR

It takes 3min.

But not all my xeon are running (20%)

my RTX 30%

IGP 5%

memory 70%

SSD 0%

as you can see on picture

Have you an idea ? Or Premiere doesn't manage 8 cores correctly...

Thanks

Steph