Make insertion to the target table quicker - forum topic by deva_048

Will block compression ='yes' statement will cause the insert statement slower ?
While doing insertion i have
SET QUERYBAND blockcompression='yes;' FOR SESSION;
INSERT INTO TARGET_TABLE (a1,b1,c1) (SELECT A1,B1,C1 FROM SOURCE_TABLE A1 JOIN SOURCE_TABLE1 B1 ON (A1.COL1 =b.COL1))
Total Number of records inserted :300000 (only 3 lakhs)
Time taken: 25 minutes