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Why does he pin this on the garbage collector?

Just an educated guess. If you're allocating tons of objects and strings and your app gets slow, it's very likely to be the GC. But I don't know V8 well enough to say for sure.

When plotting the response time over time, this educated guess becomes even more solid:

http://earl.strain.at/2010/ringo-node-benchmark/buffer-alloc...

(This uses the very same dataset underlying the "buffer alloc" graph in the original post.)

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