why GWT DevMode serialization is hundred times slower?

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GWT DevMode serialization with gwt-rpc is 100 times slower than production mode. Is there any idea why it is so slow?..

For example serialization of 1000 pojos lasts 67 ms for production mode , and 8000 ms for devmode..

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Because in dev mode every call to JS goes to server/IDE, instead of going to browser JS engine. This is especially slow if you attach to remote application through network.