I doubt millions vs more-millions of ops/sec is ever going to be a real problem for anyone as engines are only getting faster. I've never heard someone say "Oh

I doubt millions vs more-millions of ops/sec is ever going to be a real problem for anyone as engines are only getting faster. I've never heard someone say "Oh yeah, the bottleneck in our app was our use of `==`". The loops slides were more about modern engines not IE6 :P I've had mandated IE6 support before, and still support it in my personal JS libs, so I feel your pain.