I'm rather doubtful this will be fast but please prove me wrong. Here's the vertex weighting sample from CharacterFX exported to b3d file format:
http://www.3darteest.com/weighted.b3d
In this sample there are two skeletal animated cylinders. One uses rigid vertex weights (ie. only weights of 1) while the other uses blended vertex weights.
ADDITION: I just noticed that Ultimate Unwrap seems to support blended vertex weights now. Last time I heard anything regarding skeletal animation in Ultimate Unwrap it could only do rigid attachment but when I just played the above linked file it looked fine.
http://www.3darteest.com/weighted.b3d
In this sample there are two skeletal animated cylinders. One uses rigid vertex weights (ie. only weights of 1) while the other uses blended vertex weights.
ADDITION: I just noticed that Ultimate Unwrap seems to support blended vertex weights now. Last time I heard anything regarding skeletal animation in Ultimate Unwrap it could only do rigid attachment but when I just played the above linked file it looked fine.