Hi Axel,

You have two options to reduce the flicker problem in your application.

Option 1: Draw Images Off-Screen  

You can reduce the flicker when drawing large images by using a Graphics
object not associated with the form to create the image off-screen. Then
draw the image on the screen using a Graphics object of the form.

For more information on how to do this, please refer to the following MSDN
Document:

'How to: Draw Images Off-Screen'
http://msdn2.microsoft.com/en-us/library/ms172506.aspx

Option 2: Double Buffering

Double buffering uses a memory buffer to address the flicker problems
associated with multiple paint operations. When double buffering is
enabled, all paint operations are first rendered to a memory buffer instead
of the drawing surface on the screen. After all paint operations are
completed, the memory buffer is copied directly to the drawing surface
associated with it. Because only one graphics operation is performed on the
screen, the image flickering associated with complex painting operations is
eliminated.

For more information on double buffering, please refer to the following
MSDN Documents:

'Double Buffered Graphics'
https://msdn2.microsoft.com/en-us/library/b367a457.aspx

'How to: Manually Manage Buffered Graphics'
https://msdn2.microsoft.com/en-us/library/tdk2485d.aspx

'How to: Manually Render Buffered Graphics'
https://msdn2.microsoft.com/en-us/library/ka0yazs1.aspx

Hope this helps.
If you have any question, please feel free to me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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