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Message: [QUOTE="Hollow Quincy, post: 5008405"] Hi, I have to do quite long calculations in javascript. It takes some time and I can't reduce it. During this calculations browser (firefox) doesn't response. This is unacceptable. During my method I call webservices etc, but I don't change view. I can split this method to smaller pieces. But it didn't help because I do one part after another. I was wondering if timer will help ? I would like to do my script "in background" (but javascript doesn't support multithreading). How can I do long running script to not hang browser ? Thank you for help [/QUOTE]