Anytime the user does anything in Blender that makes the UI refresh, Marker Manager outputs a line of text in the console.

It can seem inoffensive at first, but anyone trying to see important information in the console is spammed by nonsense they don't need
Some actions can make several UI refreshes within a second, so the impact on performances can become noticeable, especially on low-end machines or when already doing resource-intensive tasks.
I doubt the way those prompts spawn is even relevant for developing the addon, surely there is a trigger less verbose. And regardless, this shouldn't be something the user gets, or at least not by default. If every addon did that, it would be quite a major issue.
Anytime the user does anything in Blender that makes the UI refresh, Marker Manager outputs a line of text in the console.
It can seem inoffensive at first, but anyone trying to see important information in the console is spammed by nonsense they don't need
Some actions can make several UI refreshes within a second, so the impact on performances can become noticeable, especially on low-end machines or when already doing resource-intensive tasks.
I doubt the way those prompts spawn is even relevant for developing the addon, surely there is a trigger less verbose. And regardless, this shouldn't be something the user gets, or at least not by default. If every addon did that, it would be quite a major issue.