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Re:Node.js and io.js – Very different in performance by barrkel on Monday January 19, 2015 @09:17AM (#8911967)
He was talking about differences between point versions. 0.10 has dramatically different performance to 0.11. io.js is using 0.11, as is node:master, but older node was using 0.10.

I.e. the difference isn't necessarily node vs io, it's one point release of V8 to the next as used by node and io.

Re:Node.js and io.js – Very different in performance by jacquesm on Monday January 19, 2015 @10:02AM (#8912157)
Supremely bad title then.