QTimer at 50Hz on Linux - High CPU Usage

[Elisabetta]

Hello,
I am using QT 5.8

On Windows I have no ploblems.
On Fedora 25 Using a qTimer set at 50 hz, the CPU usage rises to 90%.
If I reduce the frequency of the qTimer the CPU usage decreases considerably.

QTimer* m_timer; // in file .h
 
// in file .cpp
 
m_timer= new QTimer(); 
int interval = (1 / 50) * 1000;
 
m_timer->start(interval);
 
connect(m_timer SIGNAL(timeout()),
            this, SLOT(slotRead()));

QTimer* m_timer; // in file .h

// in file .cpp

m_timer= new QTimer(); 
int interval = (1 / 50) * 1000;

m_timer->start(interval);

connect(m_timer SIGNAL(timeout()),
            this, SLOT(slotRead()));

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Can you give me some suggestions?

Thanks in advance!
Best Regards!