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fast interacting with large number of elements inside a container (DOM, javascript)

If you want only to show/hide, without change anything in the div's DOM and you know all the IDs, I think, that the best (fastest) way to archive this would be to prepare <style /> element and append it to DOM. Style el should contain all the ID's and proper display. Iterate through IDs and add it to CSS string, then create <style /> element and append string to it. This should work for you.

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