Disorders in audio/ASIO performance

Hi,
I believe that all parameters in CUBASE 5 and the OS system are Ι seting correctly (buffer, services background, updating all drivers, Firewire / IEEE-1394 setup: old type etc)
But the ASIO performance indicator is never calm , constantly disorder and peak as if some other program worked in the backstage. When is play the project the PC Is not enough to read up in same time this disorder and indicator is relative calm , but when stoped play the project it starts again to disorder.
On this PC, I also have an independent (SSD) Hackintosh system (with LOGIC PRO X and CUBASE 8) and do not have any problem with sound performance. I do not know how and where to look for this disorder, does anyone have any some idea and can help me with this problem ? thanks

related video :
https://www.youtube.com/watch?v=KT0lBlOSoV0&feature=youtu.be

why are you using cubase 5 if you have cubase 8 ? Can you post a video of them I want to see how they differ…