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I could see the site and replicate the CPU activity issue,
but it was on the order of the seconds, not minutes.
The CPU peak while sliding the slider cannot be explained.
However, the slider seems...

Simone is not at office today; for my understanding of the GridDemo code, in both places where you put 156, you should rather use 127 (that is: 156 - 30 + 1 = 127),
as that value should represent...

Please consult a HTML expert.
I suppose that setting width=100% on the first column of a table and width=30 on the second column prevents the second column from being shown.
In your case, the first...

About:

I meant the set of all possible items to be scrolled in the page.
As long as your set is not dynamic, but fixed, i.e. item1, ... , item155, it fits to the GridDemo example.

About the...

If you still refer to our GridDemo, note that there is no NonVisualTable in it.
Each row of the table is associated to an instance of an OverwriteTable, which is created by a call to...