Durring my minecraft session, i happend to be in a pvp tournament and came across a power 5 bow. once i pulled it back my frame rate drop a lot, from a solid 30 to a 12-14.

Put the summary of the bug you're having here

What I expected to happen was...:
that the bow would draw normally with same fps.

What actually happened was...:
frames drop by 15-13

Steps to Reproduce:
1. get a enchanted bow on mac 1.6.4 of minecraft or higher
2. Draw back bow
3. fps will drop