How to convert .bin-files to .iso-files fast?

I try to convert a .bin CD image file (with no .cue-file) of less than 800 MB with iat (Iso9660 Analyzer Tool v0.1.7) to an .iso-file on FreeBSD. With an AMD FX-8370 after 30 minutes iat still has not finished yet (iat uses one core with nearly 100% load). Is this normal? Is there any way to make iat work faster? Or what other better alternative is there to convert .bin-files into .iso-files? I have multiple images to convert and I've never seen such a bad performance when handling large files. Decompression of an encrypted 20 GB archive takes less time.