Original User: vandrunenan
What is the geometric complexity of the features you are trying to load? With FeatureLayers, you are pulling all of that spatial data (within the map extent) over the wire to get the features to draw. As well, if you are using JSON (as opposed to AMF, which is only in AGS 10), the parsing of the data is particularly slow. Generalizing the spatial data is one approach that could help speed things up.