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I have a html5 project and a lot of bower components. After concatination and uglifying, the file is ~615kb big. When I try to open this js file or maybe the sourcemap file, it tooks round about 10sec to open the file. When I open the same 2 files in WebStorm it only tooks round about 2sec. Let me know if you need more information. I looked at the IDE log, there is nothing problematic inside it. For my perspective. Regards Chris