Solution : https://service.sap.com/sap/support/notes/1283197 (SAP Service marketplace login required)
Key words : 
component bc-dwb-dic, import sap_appl support packages, updatedin dependent cluster tables, read138 generating runtime object, dependent abap dictionary object, cluster work area stored, importing support packages, extremely long time, function module dd_show_nametab, considerable time delay
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