Poor insert performance

I am currently facing an issue where an insert into a table is taking ~2hrs to insert 1 M rows. It appears that its due to a foriegn key constraint. is it normal that a ref constraint can slow down things 2X times? because its 2x times faster when i disable that constraint. what could be wrong with it?

yes.
here is the content from trace o/p
Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  enq: FB - contention                         3951        0.00          1.63
  Disk file operations I/O                      143        0.00          0.00
  gc current grant 2-way                      39110        0.01         10.94
db file sequential read                    766473        0.56       3834.87
  gc current grant busy                        1917        0.00          0.81
  gc current block 2-way                        782        0.00          0.34
  KJC: Wait for msg sends to complete           185        0.00          0.00
  gc current multi block request               1835        0.00          1.22
  gc current grant congested                    233        0.00          0.06
  enq: SK - contention                            1        0.00          0.00
  gc cr multi block request                     290        0.00          0.26
  row cache lock                                 55        0.00          0.01
  db file scattered read                        259        0.02          1.97
  gc current block congested                      4        0.00          0.00
  latch: gc element                               1        0.00          0.00
  log file switch completion                      2        0.03          0.05
  gc buffer busy release                          1        0.00          0.00
  enq: TT - contention                            1        0.00          0.00
  log file sync                                   1        0.00          0.00
  SQL*Net message to client                       1        0.00          0.00
  SQL*Net message from client                     1       85.93         85.93

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