Slow Firewall Performance

[ermannobonfazi]

Just installed OPNSense, No rule in the firewall. But iperf3 with and without firewall is showing big difference. Even without firewall seems anyway not so great since I have a 1Gb interface. Other system running different flavor shows aroun 950Mbit.
Here is OPNSense with Firewall active:
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec   513 MBytes   430 Mbits/sec                  sender
[  5]   0.00-10.00  sec   513 MBytes   430 Mbits/sec                  receiver
Ad without.
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec   919 MBytes   771 Mbits/sec                  sender
[  5]   0.00-10.00  sec   919 MBytes   770 Mbits/sec                  receiver

Any suggestion or is the system this slow? I was willing to applying to a 1Gb fiber but...is clearly not enough.