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It's always a struggle to find the right configuration for the memory in the netbeans config file. But I don't think always pushing the limits of -J-Xss4m -J-Xms64m -J-XX:PermSize=512m -J-XX:MaxPermSize=768m higher and higher is the right decision. I recently had PermSize:368m and changed it to 512 since with jsps and html validation feature turned on and having 2 dozens of files opened, the ide quickly reached the 368m level. It would be a great help if nb would observer the ide's usage of memory and suggest new values for the netbeans.conf file