You can maximize the number of records visible on a page by decreasing the record height. To reduce Portal Query Result row heights, locate the Grid.cs file (<portal install>/web/App_Themes/Default/Grid.css) and make the following edits to change the default cell height from 25 to 20 points. First, complete the following change:
...
border-left: 0;
height:20px;
padding: 0px 7px;
...
font-family:"Segoe UI", Arial, Helvetica, sans-serif;
font-size:12px;
height:20px;
color:Black;
}