ECW with NAD83 (2011) definition slow to open

We have ECW files with a NAD83 (2011) definition in the header.  The header actually stores the EPSG code in this case.  These files attach extremely slow with raster manager compared to a straight NAD83 header definition file.  The design file we attach to also has the NAD83 (2011) coordinate system set, so it shouldn't be a reprojection issue.  We are using the latest Connect update 14

.8032.test.dgntest nad83.ziptest nad83(2011).zip