Datagridview very slow after enter a new cell value

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C#

DataGridView

Hello,

I have big problems of performance with DataGridView. I have a table from 5000 to 15000 lines, if I reduce the data there is no performance problem.

My DataGridView.DataSource is BindingSource and BindingSource is connected to a BindingList.

My problem appears when there is a modification of a cell, when click on entrance or click on another cell, it takes from 2 till 4 seconds according to the machine.

After numerous tests I spotted that the main part of time was between CellParsing and CellValidated.
However the method CellParsing is not in question because when I overload it (no processing) it takes always so much time before arriving at CellValidated.

I also use the event OnCellValidating: I noticed that when I fill DataGridView[][].Value the processing is very long at this moment (breakpoints) whereas if I fill my BindingList I go out immediately of my method and the slowness is after the method (I do not find where).

It is a problem between data and grid or refresh ?

What solutions?

Thanks in advance.

What I have tried:

I tried the DoubleBuffered, Row and Column no enable autosizing, ...