HEllo,
The perfomance depend of many factors 😊
Onr of, is the number of axes, but you write you have many shelves, and I thinkls many disk, no issues.
another performance factor is the network, remember also you are in LACP, only one 10G can be used by a session, NFS or CIFS.
after you hace the protocol factor, NFS or CIFS, you can maybe ahve more options with NFS.
The read perfomance "6.5 -7 Gbps" seam food, but you can try to improve your wrtite performance.
For NFS if is possible try the pNFS, nut witrh 4.1 version :
https://www.netapp.com/media/19761-tr-4063.pdf
You can try to tuneup your NFS :
https://www.netapp.com/media/10720-tr-4067.pdf
Last option for a single user is to improve network card : 40 or 100 G 😁
But remember the Ontap system is made to serve large multiple users, one user isn't the good use case