Normal map issue

Hello, I am kinda new to Blender and I had this issue for a while.

I have this issue, when I apply a normal texture through Principled BSDF shading this dots (or fragments) appear.
I do not know if it is a technical bug or I am doing something wrong.
I tried to tweak the settings but I can not get it right.
I also tried to make the resolutions of the textures bigger and it did not help.

If you know the cause of the problem, please let me know.
Thank you very much.

Is the normal map a .jpg file, or saved in any other lossy compression format? Those look like .jpg artifacts to me.

I agree - the image used for the normal (or bump) map is not optimal. In fact, it looks like anti aliasing artifacts to me…

Thank you very much.
That was indeed the problem.