GWT Compiler so so slow with 2016.2 release

Hi All,

I work daily on a GWT project with IDEA for a year now. But today I can't work anymore (due to the new IDEA ?)

When running the GWT projet ,  it starts normally till the dev mode is initialized (see below) 

The code server is ready at http://127.0.0.1:9876/
Code server started in 27652 ms
waited 14545 ms for code server to finish
Dev Mode initialized. Startup URL:
http://127.0.0.1:8888/index.jsp

Then the compilation is very very very very slow, actually I generally stop it after having wait 10 minutes  :-(  -  DevMode is 100% CPU

I had the same issue the day before, and  "File / Invalidate cache and restart" fixes it. But not today !

Any ideas ? 

Regards

JM

IntelliJ IDEA 2016.2.3
Build #IU-162.1812.17, built on August 30, 2016
JRE: 1.8.0_112-release-b287 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o