How to make asynchronous

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Hi, it would be useful if slicknav could be asynchronous. I know that it's a menu and by its nature needs to load at the top of the page, but do you have any suggestions as to helping page speed? Perhaps conditionally add asynch to the javascripts involved when a mobile user is detected? It would be helpful if slicknav could be loaded after the above the fold, but then put in place for the user as the first thing they want to see is content and perhaps the menu can wait a second or two. Thanks.