Improving Performance

You can improve the performance of Autodesk MapGuide Viewer by improving processing speed, raster display quality, and buffer processing.

Improving Processing Speed

There are a number of factors that can affect speed, some of which are known issues with specific web browsers. The best way to improve performance is to author your maps with performance in mind. See the Autodesk MapGuide User's Guide and online help for more information.

Improving Raster Display Quality

Raster images are pictures, such as photographs, that are made up of small pixels, or cells. Raster images display differently from the vector (line- and point-based) drawing data in the map, such as roads and cities. If a raster image displays poorly, do one or more of the following:

• If a raster image appears to be at the wrong resolution, right-click the layer that contains the raster image, and then choose REBUILD from the legend popup menu. To rebuild multiple layers at one time, select the layers before choosing REBUILD. To rebuild all the layers in one or more layer groups, select the layer group or groups before choosing REBUILD.
• If the colors in a raster image do not display correctly, minimize your web browser window and then maximize it again. If the colors still do not display properly, set your Windows color palette to the highest number of colors. If your graphics card does not support more than 16 colors, the colors in some raster images will not display properly. To change the color palette setting, do the following:

1. In Windows 95, Windows 98, Windows NT, or Windows 2000, click the Start button, click Settings, and then click Control Panel.
2. Double-click the Display icon.
3. Click the Settings tab, and then choose the highest color setting in the Color Palette box.

   In some cases, using True Color mode can cause intermittent problems with Netscape Navigator, so you should use the next highest setting instead. For details, see Known Issues.

   Note: If you are using the Java edition of Autodesk MapGuide Viewer, the quality of the colors displayed can vary depending on your system.

Improving Buffer Processing

When you use the Construct One Buffer For All Selected Map Features option when creating buffers, and the buffering process fails with a message indicating low memory, try decreasing the buffer offset distance. If that is not possible, try the following procedure.

To create a large, single buffer:

1. Follow the steps for creating buffers, but in step 1, select only half of the features you originally selected.
2. After creating the buffer for these features, select the remaining features that you want to buffer.
3. Create a buffer around these features.
4. Shift-click to select both buffers.
5. Create a new buffer around the two existing buffers. Use a very small value for the buffer offset distance, such as 0.01, to preserve the size of the two original buffers.