Hi.
You have to use this parameter in combination. I was spying a table containing 201 Items with 13 columns.
Without any parameters, it takes about 20 sek. to highlight it.
Using decendtree it takes about 13 sek.
Using decendtree with AncestorCount >= 10 (the AncestorCount of the table is 13) it takes about 2 sek.
Using decendtree with AncestorCount >= 10 and ignorenotshowing it takes about 1.5 sek.
Using decendtree with AncestorCount = 13 and ignorenotshowing its so fast that I cannot measure it.