Drawing an enchanted bow makes people with lower end pc's drop to 30 fps.

When I draw an enchanted bow it makes me drop to 30 fps.

I think this bug originated in 1.6.4 but it could have been 1.6.2. I go on a pvp server and drew a bow without any expectations of anything to be different.

Well when I drew my bow I quickly learned that I was lagging, I stopped drawing my bow, no lag.

To reproduce this glitch it's quite simple and I'm sure you already know since you have been reading this, but since it tells me to I will put a step-by-step guide.
1. Enchant a bow (doesn't matter what enchant)
2. draw the bow back
3. Have 30 fps, this will probably only work if you have a low end computer since I know people that this doesn't happen to. Here's an imgur link if you want a visual representation of the bug happening. http://imgur.com/a/qri1K