Slow write speeds to NFS mount

[pvoveris]

Since upgrading the firmware on my TVS-882 to vers QTS 5.0.1.2145 I seem to be limited in upload speeds to 12-15mbps while download speeds are at 50-60mbps. I also tried a direct upload via Filezilla with the same results.

I am using Mint 21 and my mount in fstab is 192.168.0.235:/Library /mnt/Library nfs4 rw,relatime,vers=4.0,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.26,local_lock=none,addr=192.168.0.235 0 0

The Linux kernal is version 5.15.0.47.

Any help would be appreciated and I would be happy to provide any more information as needed.