The GWT team make a lot of great improvements in to last year releasing GWT 2.7. One major weakness of GWT was that compilation takes to much time in GWT 2.6 and below. This is now gone GWT has not incremental compile which is super fast and compiles only the changes.
GWT 2.7 now has (Source):
- Incremental builds now just seconds
- More compact, more accurate SourceMaps
- GSS support
- JSInterop
- Great JavaScript Performance
- Smaller Code Size
