Why does memory and GPU load increase when minimizing a window created via SDL2?

Question

C++ / C#

Good afternoon, I encountered such a problem that when minimizing a window created through SDL2, the memory is clogged up to 1 GB and the GPU up to 90%, but when the window is re-deployed, the load drops.

In terms of code, it is standard, as from any simple tutorial on creating windows and a canvas.
And such problem happens if in a cycle something is drawn.

Answer 1

In such a code, in an endless loop, one core will be loaded to the fullest without even minimizing the window, do you have Windows or Linux, poppy?