TAdvGridFilterPanel takes very long time to restore filter

I have a TAdvGridFilterPanel with a grid coupled. In the grid are about 77000 rows with each 12 columns. Applying a filter takes about 3 to 4 seconds which is OK. Restoring the filter takes over 30 seconds!

When I combine more than 1 entry in the Filter the Apply takes a very long time too and the restore doubles it's time.

Is grid.FilterType = ftSuppress?

Yes, it's the same grid and filter as in the previous question about selection of suppressed rows

I will need more details. I cannot see restoring a filter needing so much time here.

Test code on a default grid with 10000 rows:

procedure TForm1.Button1Click(Sender: TObject);
  AdvStringGrid1.FilterType := ftSuppress;

  advstringgrid1.Filter.Items[0].Condition := '>50';
  advstringgrid1.Filter.Items[0].Column := 1;
  advstringgrid1.FilterActive := true;

procedure TForm1.Button2Click(Sender: TObject);
  t: longint;
  t := gettickcount;
  advstringgrid1.FilterActive := false;
  caption := (gettickcount - t).ToString;

procedure TForm1.FormCreate(Sender: TObject);
  advstringgrid1.RowCount := 10000;

Takes less than 1000milliseconds to remove the filter

We have near to 8 times more rows in our grid. Could you try and increase the row count? B.t.w. setting the same filter again by clicking 'Apply filter' more than double the time needed to apply the filter (again).

Hi Bruno,

I've created a project that reproduces the problem.


TMSGridFilterTest.zip (37.2 KB)

I've found the problem using elimination of the properties set. This piece of code causes the delay with filtering.

advstringgrid1.FilterType := ftSuppress;

B.t.w.: we are still at with Rad Studio 10.4.2.

Can we use with Rad Studio 10.4.2?

  1. supports 10.4.2
  2. We have indeed seen a performance difference between ftSuppress and ftHide. It looks like the performance difference comes from the underlying base class TStringGrid. We are investigating if we can find a solution for this. To undo the filter, it should already be faster to use a BeginUpdate/EndUpdate block around grid.FilterActive = false

We found a drastic performance improvement for FilterType = ftSuppress that can now remove the filter for 80000 rows in +/- 100ms.
Next TAdvStringGrid version will have this performance improvement.

Can you give me an ETA?

With no unexpected issues, Nov 22.

I would like to assess the changes in the VCL Ui Package. Can I find the release notes somewhere online? I did find the (i) icon in the Subscription Manager but that only shows the issues and doesn't give me the possiblity to f.i. search etc.

Yes, see version history on the product page:

I also notice strange behavior when scrolling the grid when the filter is active. Could be related. Without the filter scrolling with the mouse wheel is fluent. With the filter active it stutters.

Could be related to large nr of rows filtered (invisible) and needing to be skipped during scrolling.