Performance issue with selection of data on a table

Col3 is taken out from where clause, i cannot include col3 in the index def because the data length in col3 is more than 8000 characters.

Select Distinct Col1,Col2,Col3 + CHAR(13) + CHAR(10) Col3
From Table
Order by Col1,Col2

Distinct has to be there as there are duplicates in the table. How to improve performance now.

Thanks,Eshwar.

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