JSNI badly slow in debug mode

Hi, There,
I have a application which uses GWT's canvas to set the Image
data color. For a picture, say, 500*500 pixels, the consumed
overall invocation time in debug mode is totally unaccepted due to
the doInvoke method in com.google.gwt.dev.shell.ModuleSpaceOOPHM
class.

The code snippet
.....

TreeLogger branch = host.getLogger().branch(TreeLogger.SPAM,
"Invoke native method " + name, null);
Event javaToJsCallEvent =
SpeedTracerLogger.start(DevModeEventType.JAVA_TO_JS_CALL);
if (SpeedTracerLogger.jsniCallLoggingEnabled()) {
javaToJsCallEvent.addData("name", name);
}

CompilingClassLoader isolatedClassLoader =
getIsolatedClassLoader();
JsValueOOPHM jsthis = new JsValueOOPHM();
Class<?> jthisType = (jthis == null) ? Object.class :
jthis.getClass();
JsValueGlue.set(jsthis, isolatedClassLoader, jthisType, jthis);
branch.log(TreeLogger.SPAM, " this=" + jsthis);

....

Can I bypass the log in debug mode ? Or any idea I can speed my
debugging?

Thanks in advance.
OrNot

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