Are you redrawing the whole map while panning? IMO, you should draw the map on an offscreen windows, and this map is bigger than your display window (like one more window on each sides plus diagonals). When you pan, you just copy the correct region from the offscreen to display window without requiring to redraw the whole map again. elv "Bruno" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > hi all, > > I am working on a program that display vector map, > however I found that when I draw (or redraw the map when panning and > zooming) the map, > it is very very slow (the size of one record in a file is about 10 ~ 20KB) > any suggestion to fasten the speed? > thx! > > >
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