Video of the bug in question:
https://youtu.be/jKzbgzclvUk
Basically, if you don't light weave on your bow, animations play normally. If you do light weave on your bow, then your animations are severely delayed, resulting in an overall DPS loss due to the slowdown. This wasn't happening in 4.1.0. This doesn't seem to affect any other weapon tree, and I've seen it happen on sorc and nightblade so far.
PC/NA - Mayflower, Hellfire Dominion
Dro-m'Athra Destroyer - Divayth Fyr's Coadjutor - Voice of Reason - Gryphon Heart - The Unchained - Extinguisher of Flames
Tank - Healer - DPS (all classes, all specs)
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