The Anti-Aliasing view option in the View menu removes the jaggies (aliasing) during the screen representation, as the edges of the objects are smoothed.
The Anti-Aliasing mode makes the screen redraw slower.
The Anti-Aliasing mode is automatically switched off in the zoom levels higher than 16x.
The screen redrawing in Anti-Aliasing and Spot Colors mode is quite slow if the map has a lot of objects or big raster background maps are loaded. In this case we recommend to switch off Anti-Aliasing.
Read more about Anti-Aliasing on Wikipedia.
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