Why is refreshing on scrolling so slow!?

Question

So here's a question about windows forms in general.

Why is it that when I scroll a control, using the built-in auto-scroll feature, I can watch the form redrawing itself. When I scroll something like IE, I can still read the text on the screen, but when I scroll a form I cannot.

Is this just an inherent weakness in windows forms, that it is ungodly slow? Or is it something that I'm doing / failing to do?

Answer 1

Could you be more specific as to what portion of the drawing is so slow? Can you post some code that performs really bad on your machine?

Answer 2

Specifically what is slow is the display of labels in a TableLayoutPanel.

As for what code performs poorly, I'd have to work on that. I'm reworking some legacy code and I can't easily abstract a good section for you to see. Here's the general structure though:

Form - no-auto-scroll
--Panel - auto-scroll
---TableLayoutPanel - 2 Columns, 15 rows (this one scrolls fairly smoothly, but still not great)
---TableLayoutPanel - 10 Columns, 50 rows (The labels here streak verticall across the entire screen as you scroll up and down)

I'll see what I can do about gutting some code for examples. But I'm not doing any processing onscroll.