GWT Performance Issues

I was wondering if anyone has had any issues with performance in GWT and how you solved it. Right now there is a project I'm working on where I get some json and generate some views and it's maybe 100 items long and GWT takes around 8 seconds to render it in Chrome. I'm concerned because I'm going to be working on a bigger project and was planning on using GWT but now I'm not so sure. On the bigger project it could end up taking 30 seconds or more just to render the views each time they open a new page.

I've read about using timers to try and keep the DOM from freezing, but it prolongs the rendering period. Is there any way to improve performance in GWT, or is this just how the framework is? I've done stuff in Sproutcore before and didn't have any issues with performance, but I'm not sure it's the right framework for the project I'll be doing.

Any thoughts would help. Thanks in advance!

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