Performance : difference between CLOB, BLOB ?

Hi,

Our application generates files in different format : .mat , .xls .

Actually these files are transformed in text format and then stored in the database in a CLOB column.

But we are experiencing performance problems.

Would the performances be better if we used a BLOB column ?

Or would it be better to use the BFILE type to point to theses files ?

Rgds,

Rachel