WinGrid performance issue has been found when highlighting the whole WinGrid.

I have attached a sample project to show the performance issue.

This grid in the sample project has 100 columns and 500,000 rows

Using CellDataRequested, all of 500,000 rows are filled with data. I attempted to click the first cell of the first row, pressed Shift key, and clicked the last cell of the last row in order to select the whole Grid.

Then, it freezes and takes up a lot of memory.

Is there any way to do this operation quickly without wasting a lot of memory?

Any help or suggestion will be greatly appreciated.