Latest Dart Editor is unresponsive on win xp

[DartBot]

This issue was originally filed by podivilov@google.com

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I'm using Dart Editor on my win xp laptop with 2GHz, 2Gb Ram.
Everything work ok until 'dart:html' is imported. With 'dart:html' even a tiny web app becomes very unresponsive. Autocomplete, copy-paste, save and some other actions take 20-40 seconds, which make the editor completely unusable.

Using fresh editor copy doesn't solve the problem.

[devoncarew]

Is this with the last integration build (9474), or with a build from continuous?

[DartBot]

This comment was originally written by podivilov@google.com

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It was with 9474, but now with 9661 everything is fine again. Thank you!

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Added Fixed label.

[clayberg]

Added this to the M1 milestone.