Since Macrumours won't let me post a link to a performance comparison I did on another Mac blog (not my own), I will attach my performance based comparison of here. The only reason I did post it was to help those who are on the iPad 2 work out whether or not they want to upgrade.
iOS 9 vs 8.4 versions on a backup and restore install.
Screen Shot 2015-09-17 at 10.01.01 am by oldmacs, on Flickr
iOS 9 vs iOS 8 and earlier on a clean install.
Screen Shot 2015-09-17 at 9.35.29 am by oldmacs, on Flickr
iOS 9 vs 8.4 versions on a backup and restore install.
Screen Shot 2015-09-17 at 10.01.01 am by oldmacs, on Flickr
iOS 9 vs iOS 8 and earlier on a clean install.
Screen Shot 2015-09-17 at 9.35.29 am by oldmacs, on Flickr
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