I did a performance comparison of iOS 8 and 9 (and other versions) on the iPad 2 here - http://www.mactalk.com.au/content/ipad-still-won-t-die-ios-9-ipad-2-3759/ if anyone was interested to read it 
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iOS 9 on the iPad 2
- Thread starter oldmacs
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Well done, thanks! I'm still running iOS7 on my ipad 2s and sounds like I probably will continue to do so.
If you don't mind security flaws, then its probably the best way to go, until Apple releases the inevitable performance fix releases.
I did a performance comparison of iOS 8 and 9 (and other versions) on the iPad 2 here - http://www.mactalk.com.au/content/ipad-still-won-t-die-ios-9-ipad-2-3759/ if anyone was interested to read it
I have an iPad 2 as well - followed through all updates and can see it getting slower, but then again... it is old hardware. Sure, it'll run it - but, not like the new ones. I went as far as a clean install and I have to say, it didn't much matter. From iOS 8+, it's a workload on it. Just getting time to upgrade. After all, it's 5 years old (?). Most computers show their age by then, too.