When you go to the home screen in Minecraft (where it says "Singleplayer", "Multiplayer" ect.) and click on the "Multiplayer" button the servers start to shake up and down very rapidly. Less servers means more shaking. If the window is small, it doesn't shake.
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Duplicate of MC-50965 – If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
The same in singleplayer menu.