'Fullscreen Form with a maximum form size lagging

I'm making a game, and all of the pictureboxes sizes and locations are based on an 1920x1080 resolution (as that is my screen size). But when the game is played on a different resolution, the game doesn't fullscreen, (using FormBorderStyle = FormBorderStyle.None; and WindowState = FormWindowState.Maximized;), because I have set the maximum form size as 1920x1080. The problem is, that when the game is played on a bigger resolution monitor and the form doesn't fill up the entire screen, the game gets extremely laggy and slow. Is there any way to fix this? Perhaps by adding black bars around the game?



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