Set up:
Motherboard: C246M-WU4
CPU: Intel G5420
Memory: Kingston 8GB DDR4 2400MHz ECC-Unbuffered
Boot Drive: Nvme m.2 - 250GB
Main Pool: 8 HDD (4TB) = 2 disk X 4 vdev in mirror group - 4 Seagate and 4 WD Drives
Second Pool: 2 Samsung SSD (1Tb) in mirror vdev
Network Card: Intel X540-T2 10G Dual RJ45 Ports
So when I tried copying files from TrueNAS to my main PC(samsung Nvme 500GB), I am getting around 198MB/sec, but I tried copying same files back from my main pc to TrueNAS, I am getting 300-370MB/Sec.
I believe I should get more than that.