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The most efficient way to generate circles or shapes on a C# bitmap is to use the Graphics class and its DrawEllipse, DrawRectangle, or FillEllipse methods. These methods take arguments such as the brush, pen, size, and location to draw the shapes on the bitmap. Another way to improve efficiency is to use a pre-drawn image as a template and clone and modify it as needed using the Clone() method. This reduces the need to redraw the image every time a modification is made. Additionally, using multithreading to draw shapes simultaneously can increase speed and performance.