Usage of use-fast-replay for FileChannel

[Rahul Ravindran]

Hi,
   For FileChannel, how much of a performance improvement in replay times were 
observed with use-fast-replay? We currently have use-fast-replay set to false 
and were replaying about 6 G of data. We noticed replay times of about one 
hour. I looked at the code and it appears that fast-replay does not guarantee 
the same ordering of events during replay. Is this accurate? Are there any 
other downsides of using fast-replay? Any stability concerns?
Thanks,
~Rahul.