first of all MP3Tag is the greatest Tagger. Good Job.
Ok, I have an issue for you. Unfortunately it is not possible to attach a testfile for debugging yet.
So I will describe what I know.
Traktor Pro 1.1 writes stripes (grid, sync information, Cue points, etc.) into audio files after analysis.
On OGG there is a field created, TRAKTOR4, contains more than 4 KB of data for a normal track.
When MP3TAG 2.43c tries to read one of those OGGs it takes long time (>5 seconds with 100% CPU usage).
Also editing TAGS with MP3TAG is very time consuming.
You can imagine reading hundrets of OGGs requires long long time.
The issue disappears when I delete the TRAKTOR4 Tag, but the stripe for Traktor PRO is lost, too.
If you want to have a test files, please let me know.
Thanks a lot