Cant it be solved ? LinuxCNC slows down even dead

As Tommylight pointed out it seems your acceleration is set low. Have you tested to see if it can safely be increased? There may be a good reason it is set where it is but it seems common for acceleration to be about 5 times velocity.
The backlash may cause some issues particularly with low acceleration.

having all the cards , drivers, etc .

What are they?

Rick G

As a quick concrete example, with your present per axis maximum velocity and acceleration settings,
(50 mm/s velocity and 100 mm/s^2 acceleration) the smallest corner radius you can follow without slowing down
(below 50 mm/s) is about 25 mm (and about 1.5 mm radius at 12.5 mm/s)

tommylight wrote:
What machine type, drives, motors, ballscrews, belts, rack and pinion, etc.
Pictures would help, attach the config files, if possible.
Regards

I was in some problems.
These are the pictures and the configs I already sent.
Inform me about it .
Issues occuring . Tired much but not solved

Also tell me if this last one drive works ?