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Pl post OS details, the complete exp and imp commands, and the first 10 lines of the exp and imp log files. Have you tried using expdp/impdp instead ?
Pl see this MOS Doc
Export and Import of Table with LOB Columns (like CLOB and BLOB) has Slow Performance [ID 281461.1]
I would start by trying Data Pump (expdp) instead of old export (exp). The new access methods of Data Pump may make this table with the clob move faster.