Grand 3 CPU & disk access performance issue

I just installed Grand 3 on a not too old PC with :
i7 2.90GHz and 8GB RAM
256GB SSD drive,
but I have many performance problems, mainly with disk access and when the number on notes played is high. Disk access is then 100% on my system.
I checked with another PC with newer and faster SSD and it works perfectly…

I understand that G3 is already few years old, therefore my PC should not be a problem (its specs was in the higher part 4 years ago…).

Any advice on other to tweak my system to make it work ?