Comment #5 on issue 2551 by [email protected]: 3.16.14.1 - String::Utf8Length() absurdly slow for lefty cons strings
http://code.google.com/p/v8/issues/detail?id=2551

The worst of this is addressed in https://codereview.chromium.org/12390057/.

If it's still too slow after that, I will add some micro-optimizations back in, but there will definitely be some performance regression as we no longer track ASCII in v8, which made utf8 conversion extremely fast.

I'd appreciate it if someone would rerun those tests with the patch applied so I know how far off 3.15.11.15 we are.

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