gwt 2.7 And speed tracer?

Hi.

My app is running slow and I saw that speed tracer is supposed to help. me in "finding where and why things are slow"

HOWEVER I really have issues:

1)On the official page  it seems that the link to install speed tracer chrome extension is "out"... (where can I found the chrome extension compatible with the tools that I am using?)

2) when in eclipse I try to use the speed tracer porfile... in the end I have an error message:

An internal error occurred during: "Launching barter01 using Speed Tracer".

Could not initialize class com.google.gwt.eclipse.core.speedtracer.SourceViewerServer

for information I use 

chrome Version 40.0.2214.91 m

GWT 2.7

eclipse 4.4.1 and the google plugin for eclipse 

thank you for your help

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