Sync running VERY slow

Hello,

I'm trying to run a ~80GB sync using Toucan 3.0.4 on Windows 7 (32bit) mirroring from my main drive (NTFS) to a FAT32 external drive, and it's incredibly slow.

I started the job last night around 10pm and now (7:30am next morning) progress bar indicates a job completion rate of some 5-10%. At this moment, Toucan is copying cache files from my Mozilla profiles folder, each weighing in at some 30kB, at a speed of 1 of these per every 10 seconds!

I had Comodo Internet Security running during the night, so I switched it off (as well as Skype, Dropbox, Opera, just to be sure) but to no avail.

I haven't stopped and restarted the job for I'm afraid that I would even loose what has been done so far, so this is why I ask for your help. - Is it the drive formatting? But then, there is no such lag when I copy files there manually.

BTW, Toucan's CPU usage is at a constant rate of about 50%.

Thank you for any suggestions!