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When loading an MrSID raster into a geodatabase, it takes much longer than loading the same raster data in a different format.
MrSID raster datasets are normally highly compressed with a lossy compression algorithm. When loading MrSID datasets into a geodatabase, they are first uncompressed to get to the actual pixel values, which are then loaded into the geodatabase. The uncompressing of the MrSID encoded data results in the long processing time.
To reduce the overall processing time:
In general, it is not recommended to load MrSID or other lossy-compressed raster datasets into a geodatabase. The storage space required is significantly increased over the original MrSID file, and the quality of the data is not improved. We recommend loading the original data from which the MrSID was created.