Forked from https://code.google.com/p/dart/issues/detail?id=15134#c8

I downloaded the latest devchannel release (1.1.0-dev.5.11) to see how it changed.
The performance differences between setAll and setRange are gone.
For the Dart VM I could only see a minor performance improvement. I can now transfer 270MB/s using a plain TCP/IP connection on localhost and 100MB/s using a Dart IO websocket connection.

For Dart2Js the difference is very obvious. I can now send using WebSockets on Firefox with 200MB/s, which is quite amazing for a websocket connection. Dartium is unfortunatly quite behind at 60MB/s. Current Chrome release is a little bit higher with 80MB/s.

So all in all from the array handling point of view it seems OK now. The critical pathes now seem to be the IO and especially the websocket implementations.