Block Change Trackin Performance

Hi,
I'm planning to use incremental backup with Block Change Tracking(BCT) enabled.
Well i see the good points of BCT like reducing network traffic and cpu cycles such that when RMAN checks for datafiles that has changed in block, it will use the BCT file instead of checking the datfile one by one.
Now it cannot yet implemented it because of this question?
"How is the performance hit of BCT?" If there is a block / blocks that are updated / changed, BCT will record it in the file, how much of the resources of the server will be used? Is it too much that it will cause slowness in daily transactions?"
Hope someone will help,
Jay

There will a "small" overhead as per the documentation.
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/bkup004.htm#BRBSC125
<quote>
Change tracking is disabled by default, because it does introduce some minimal performance overhead on your database during normal operations.
<quote>
I also have seen some bugs in 10gR1 related to database hanging issues after enabling BCT but those have been fixed in 10gR2.
All said, you can carry out some testing in your test environment to measure the performance overheads, if any.

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