Improving Paint performance while Scrolling

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I have a pretty large UserControl (2000 pixels high) on which around
1000 smaller controls are embedded. When I scroll this whole thing
using the mouse wheel, everything gets rendered nice and clean. On the
other hand, if I scroll by moving the scrollbar, the display kinda
waits until I let go before it repaints. This is more pronounced if I
scroll fast, it's reasonable when I scroll in small increments.

Is the Painting supressed when scrolling? I've done selective
optimization for some controls using ControlStyles.


Thanks!

.

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