Cubase 6+Network hard drives

Hi
Does anyone have experience working with Cubase 6 and network hard drives ? I must sharing the same HD’s (now a use a NAS array) because my studios sometimes works in the same directory (not with the same session). I use a NAS server, but the system gets vey slow. Zoom, play many tracks… not work fine. My network is giga (1000).

Anyone have experience ? Does Cubase 9 have the same problem ?

Thanks!

Mini Mac i7 -512 SSD - 16 Gb RAM
Cubase 6
NAS Server DSM 412+