Datasource of type View donit user find first fast

I have a View in a datasource on my Form 

it is the second datasource,

on the init I Add these lines

  public void init()
        {
            super();
            this.queryBuildDataSource().firstFast(true);
            this.queryBuildDataSource().clearDynalinks();   
            this.queryBuildDataSource().addDynalink(fieldNum(View,field1),ParentTable,fieldNum(ParentTable,Field1));
            this.queryBuildDataSource().addDynalink(fieldNum(VIew,field1),ParentTable,fieldNum(ParentTable,Field2));
        }

it works fine, but it is slow with 3000+ lines, with trace profiler I see the query is not with option find first fast.

PS. the query below the view has on all places find first fast.