Why doesn't Blizzard fix the strange twitching of the image

The game has had a problem with strange micro staters for a long time, and it doesn’t matter what FPS you have, 60 or 240 doesn’t matter. If you change any of the graphics settings during the game, the image becomes smooth as it should be, but after restarting the game, the problem returns. Monitoring like MSI afterburner does not detect any twitching of the image. Such slowdowns appear randomly, but regularly. They look like a non-uniform smoothness of the image. Smoothly smoothly, and then the smoothness disappears for a few seconds and so on constantly. It’s not about PC components or the Internet.
People have already asked this question on reddit and other forums, but they have not found an answer.
I ask Blizzard not to ignore this problem and finally solve it.

I am not having this issue, make sure you have updated graphics drivers, doubtful there will be anymore code changes at this stage of the game.