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Performance issues: summary and scrolling
posted

Hi,

  My grid contains and series of rows which each belong to a parent group:

    A
    |_ A1
    |_ A2
    B
    |_ B1
    |_ B2
    |_ B3

  etc.

   We have custom summaries set for A and B that aggregate values for their children and return a single value to provide for that column at the group-level. 

  When we scroll through the grid (using the scrollbar) performance is really really slow (when using the mouse-wheel is literally un-usable).  I ran it through JetBrains quickly and the trace looked like the attached image.

  It seems that get_SummaryPositionColumnResolve calls Contains which takes over 55% of the time used during a simple scroll operation. 

  Is there any advice for how I can reduce this and improve the performance I see when scrolling through a grid with many groups?

Thanks