Sorry if you already are doing or have already check any of this, this is just what pops into my head when i hear slow profiles.
What is your file server OS?
If it's 2008 take a look at this, you are going to want to be running SMB 2.
Do you have the CIFS license on the NETAPP, can you use the NETAPP running CIFS and see if you have the same results, might be too difficult for a test.
You should remove chrome from your roaming profiles. Chrome has a GPO that will put the chrome profile in a network location, i typically use the Documents folder and capture that with folder redirection.
You could also take advantage of using a redirected app data folder in combination with roaming profile, this way the only the registry is roamed.
In the past i didn't use appdata redirection then i did for 1 client, now i always do.