I have a complex web application that I have to get running under IE8 (no
choice on this). I've been dogged by performance issues for weeks. The
application runs really slow. I get the annoying "Do you want to stop
running this script?" warnings. We've been optimizing for weeks and made
some progress getting it to run faster with fewer script warnings, but
still not quite there.
Then, I noticed that the application performs great when I'm hitting
gwt.codesvr. The application runs quickly. I get no script warnings. This
is counter-intuitive, because I've found that applications perform worse in
dev mode than with compiled mode.
I couldn't figure why. So, I went to a colleague and he suggested looking
at the compiler settings. I found that we had them set like this:
<set-property name="compiler.stackMode" value="emulated" />
<set-configuration-property name=
"compiler.emulatedStack.recordLineNumbers" value="true" />
<set-configuration-property name=
"compiler.emulatedStack.recordFileNames" value="true" />
I set recordLineNumbers and recordFileNames to false. Instantly, the
application performed much better in compiled mode. The speed was now
comparable to what I was seeing with dev mode. I did some more research on
the forums and found that running stackMode as emulated impacts performance
as well. So, now I have them set like this:
<set-property name="compiler.stackMode" value="strip" />
<set-configuration-property name=
"compiler.emulatedStack.recordLineNumbers" value="false" />
<set-configuration-property name=
"compiler.emulatedStack.recordFileNames" value="false" />
This helped performance a little. Not as dramatic as changing the other
settings to false, but there was some improvement.
Here's my problem. I'm still getting the "Do you want to stop running this
script?" warnings in compiled mode where I don't get them in dev mode. Is
there something else I can try to get compiled mode to perform like dev
mod? Is there a compiler setting (or some other setting) I can look at that
could help? What compiler settings are being used in the code server? Is
there anyway I can see how they're set? Any other suggestions?
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