Double buffering with Panel

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Use a PictureBox if you don’t need scrolling support, it is double-buffered by default. Getting a double-buffered scrollable panel is easy enough:

using System;
using System.Windows.Forms;

class MyPanel : Panel {
    public MyPanel() {
        this.DoubleBuffered = true;
        this.ResizeRedraw = true;
    }
}

The ResizeRedraw assignment suppresses a painting optimization for container controls. You’ll need this if you do any painting in the panel. Without it, the painting smears when you resize the panel.

Double-buffering actually makes painting slower. Which can have an effect on controls that are drawn later. The hole they leave before being filled may be visible for a while, also perceived as flicker. You’ll find counter-measures against the effect in this answer.

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