Thank you for playing our game and giving feedback! Yes, every time particles on Godot were being shown for the first time in some gameplay there is a bit of stutter and while it is not a game breaking bug, it is something that interrupts the gameplay.
I actually did consider just showing those particles to counter this stuttering issue when these particles show up at the start of the game, so that during gameplay it wouldn’t interrupt the flow of the game (But this did not end up happening). So, after reading your post about the whole thing, I will consider the method you are telling me about fixing this particles issue in my future games!