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    <p>I have been using GWT for nearly 2 years. Although I could be called a fanatic about GWT, there are some issues that one should know ...</p> <ol> <li><p>As others have said, JavaScript compilation is slow. My application requires nearly 4 minutes for core i7 CPU, 8 GB memory. Total size of generated JavaScript is about 5 MB. But thanks to development mode, compilation to JavaScript is not needed frequently. </p></li> <li><p>GWT RPC is extremely slow in development mode. It is 100 times slower than hosted mode. It was quite a big problem for us. We did consider giving up GWT just because of this reason. the reason for this sluggish performance of GWT RPC in dev-mode is serialization. Serialization of types other than String is unbelievably slow in dev mode. We did implement our custom serialization, it is nearly 30 times faster than GWT built-in serialization.</p></li> <li><p>Claims that writing GWT application requires only knowledge of Java is just an illusion. You should have solid information about CSS and DOM. If you don't, you will spend too much time debugging your user interface.</p></li> <li><p>You should consider that you can only use a small subset of the JDK to implement GWT applications. Reflection is not available; you should use third party libraries, such as <a href="http://code.google.com/p/gwt-ent/" rel="noreferrer">GWT ENT</a>, or write your own <a href="http://francisshanahan.com/index.php/2010/a-simple-gwt-generator-example/" rel="noreferrer">generator</a> for reflection. </p></li> <li><p>Another caveat that one should consider is the size of generated JavaScript by the GWT compiler. Most of the GWT applications consist of a single web page, as opposed to multi-paged traditional web applications. Therefore, loading of the application requires significant time. Although it could be mitigated by using a multi-module approach and code splitting, using these techniques is not always straightforward.</p></li> <li><p>All calls to the server are asynchronous. You should adapt yourself to writing asynchronous code. And the downside of asynchronous code is it is more complex and less readable than the equivalent synchronous code. </p></li> </ol>
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    1. USNathan Hughes
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    1. COThank you very much for sharing you experience. These are very valuables for us.
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      1. USAerosteak
 

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