#Optimization killers (from https://github.com/petkaantonov/bluebird/wiki/Optimization-killers)
##Introduction
This document will contain advice to avoid writing code that will perform significantly worse than expected. Specifically those patterns that cause V8 (relevant to Node.JS, Opera, Chromium...) to refuse to optimize the affected function.
vhf is also working on a similar project that tries to list every killers in V8 Crankshaft Engine: V8 Bailout Reasons.
###Some V8 background