Gwt-App totally blocks Browser-UI

At the start of my App the Browser has to load some stuff and create some data objects (Trees). The Problem is, that this blocks the the whole browser (no tab switching no reaction on user interactions, even my animated loading.gif is not loaded/animated). In swing applications the is a "SwingWorker" to keep the ui running - for example to display a progress bar.

But how to achieve this with GWT? My guess is to use Scheduler some how?! I want to get the loading more in background and keep the browser more responsive. But how to do this?

thx in advance

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