To a big extend, it depends on Windows and how it is able to assign the job to nVidia GPU (usually Intel GPU would be doing the calculation, Windows has to move it to nVidia (AMD laptops usually do not have 2 GPUs so there should not be this problem)).
Also, you should play in (Borderless) Windowed mode - Fullscreen doesn't have to work.
And how big FPS drop depends on how much the nVidia/AMD is used my the game - since both, game and DL driver, will want to use it.
But DisplayLink docking stations/adapters are not really for gaming. Their main purpose is office work.
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