very slow speed with OPNSense

[mathais]

Hi, I was using pfsense, but now, I switch to OpnSense.
I have a big problem with my download and upload speed.
With pfsense : 1500MBPS download speed and 650MBPS upload speed.
With OPNSENSE : 250MBPS download an 90MBPS upload.

I'm using a PC with Intel(R) Celeron(R) N5105 @ 2.00GHz (4 cores, 4 threads) and 16Go of RAM.

What is my problem ?

Thank you