thanks for your reply Vim,
My FD version is 1.5.1 - i've downloaded last week through the link I originally got when I purchased the software . the file name doesn't say which version it is, but since I've downloaded it last week, I believe it's 1.5.1.
I'm mixing electro-house music.
My laptop is Sony Vaio with Pentium M 1.7 Ghz and 1.5GB of RAM.
Of course I've optimized the performance - killed unnecessary processes, disabled battery reading, firewall, etc. (same settings I use to 'rock' when I used bcd.
Master tempo (key lock): disabled.
I also noticed that it takes significantly more time (if at all) for the software to identify the bpm (with previous versions of BCD - it use to take 2 seconds or less). Even after FD gets the right bpm, it doesn't keep in sync for long: you got to keep Sync Slave pressed in order to 'lock' that synced bpm.
Since there's no manual, It'd be nice if the whole Sync Slave process would be explained - since it seems to vary from one version to another.