James Free writes his observations of ESRI MVP types moving away from ESRI servers (ArcGIS Server, ArcIMS, ArcSDE) to Open Source for web publishing. The MVPs report Open Source is faster and offers better value.
This lines up with anecdotal reports I'm hearing from developers. For instance, developers on the West Australia's Landgate project compared optimized Oracle Spatial + ESRI SDE with unoptimized PostGIS and found PostGIS ten times faster for the queries they were running.
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