How do I stop Determining Gapless Playback?

Yet again, another iTunes upgrade has caused the horrible gapless playback scan to occur on my iTunes library. As a result, iTunes is totally unresponsive until this action completes. In my case, it's really slow as I'm accessing my files wirelessly from a network drive. I have to keep canceling the rescan to use iTunes. For the most part it keeps track of where it left off, however some files keep getting rescanned.

Here's what I've observed so far (not that it solves anything)
- it appears that rescans are triggered whenever an upgrade rebuilds the library. After going through this once for iTunes 7 upgrade, I remember it occurring again for 8 (and probably a point release in between) and version 9.
- The gapless playback mp3 tag doesn't seem to stop the rescan from occurring. I tested this for files that kept getting rescanned. I first set them to No and they still got scanned. Next I set them to Yes and still no luck...
- The number of files being scanned are less than the total number of files currently in my library, which leads me to believe the rescan trigger has to do with either when the file was added (i.e. before iTunes 7 release) or based on what version of iTunes the file was created.

Based on the above, I think this is a bug as it should only go through this once and if needed when new files are added to iTunes. Better yet, there should be an option to shut this off completely!

Any info on what causes this to occur or how to make it stop would be greatly appreciated!!!