I’m on Windows, not MacOS.
My bad for not checking extensions. Now I believe it is a combination of “Better Search Views” plugin and the fact that the search result updates are not throttled by Obsidian.
I will try to raise the issue in the plugin repo, but I wonder whether I should as well rise a feature request (not a bug report) for Obsidian itself.
While the search is responsive in restricted mode, it seems even unnecessarily so, just flashing updates until the results settle. And it rises the chances for it to align with other things to cause issues in real world.
Update: opened Throttle/debounce the search input