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copied!<p>Hey. As a disclaimer, I work for the company developing Vaadin.</p> <p>Vaadin uses GWT in a way that it has a set of components precompiled in GWT. You can, of course, additionally make your own components if you so want to. However, the set of components is quite complete, and can often be customized for your own need. This means that you don't have to recompile your code from Java to JavaScript every time you change your application. You just combine the already available components together. </p> <p>The framework is server driven, so all logic is handled on the server side. The components has two parts, client and server file. The client side is just a dummy "view" for the component. Once you interact with it, it sends a message to the server that this or that was pressed/written/etc. The server then decides what should be done. This is for increased security, because you can't "hack" the logic as only a small API meant for sending requests is available in the javascript. This may be in some cases a little trade-off with speed of the application, but I don't think it is a so bad. Worst speed bumps are usually db query round-trips and such, which doesn't have anything to do with the choice of the UI framework. Sluggishness of the demos as suggested can be because you're far from the server or there is a high user hit at the moment. Try it in an own environment, close the the final application of your application, to see how well it performs. There are some ready application that you can just deploy to test it out.</p> <p>I guess the choice boils down to what you are trying to do. Vaadin is good for web applications, as you can build a normal Java application and do the dynamic web UI for it easily. If your doing something more of a traditional web site, where users only views the page - more than actively interacts with it, then Vaadin is not the best way to go. Go with some other free frameworks like rails or a php framework etc. I think that you're more doing an application as you're suggesting that you are using GWT now, so Vaadin should be good.</p> <p>Ask more questions, here, on the Vaadin forums or at the irc channel #vaadin @freenode and maybe someone can give you more reason to why or why not use Vaadin.</p>

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