title: How to filter out some shapes to in a map window using WinMapGIS or DotSpatial library
body: <p>I have big street shape file of all California roads. It takes a very long time whenever I make the map window to redraw the map (zoom in, zoom out, moving the map around ...) . I wonder if there is any ways to tell the map windows to render only a certain number of streets based on a specific extent. That way I can improve the overall performance of my application. Any help would be appreciated. </p>
  
  <p>Vu Tran,</p>