Multithreading in SmartClient

[gwtbr]

I want to know if I can use multithreading in GWT.

My application have some situation that need to render many registries in a ListGrid. It causes a delay in the interface.
I want to make a progressbar with multithreading to ilustrate and enable to the user the option to cancel the process.

PS: The class com.google.gwt.core.client.Scheduler don't solve this problem...

Thanks!

[Isomorphic]

There's an HTML5 feature "web workers" that provides this. It is not widely supported yet. Even so, there are some options for using it from GWT.