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I'll attach a patch against clazz module that will reduce number of loaded classes after IDE start from 11 to 3. You could review it and if you don't agree with the way of delegating creating ClassDataObject instances from ClassDataLoader to ClassDataObject, you could remove this part, yet still 5 classes will be spared (6 if you abadon usage of Util in favour of NbBundle.getMessage)
Created attachment 1487 [details] Patch for clazz module to strip 5-8 classes during startup
PS: Don't forget to increase dependency on OpenIDE to 1.10 as the new API it uses is @since 1.10
Thanks for the patch.