kelvin wrote:GWT Designer makes eclipse 3.3.2 java editor very slow.
but it works wells in eclipse 126.96.36.199
There are virtually no differences between those two Eclipse versions (and no differences in how GWT Designer runs on them), so I would look at local configuration issues for both Eclipse installations.
I would start by looking at your Eclipse memory settings. If your Eclipse memory settings are too low, it is easy to cause Eclipse to start swapping due to having any extra plugins loaded.