Navigating settings, opening apps, and using the keyboard will feel significantly faster compared to iOS 9.3.5.
Download the IPA file from the official trusted source. downgrade ipad 2 ios 9.3.5 to 8.4.1
If your iPad 2 feels like it's wading through molasses on iOS 9, do this. The performance improvement is dramatic. But be prepared to lose modern app support. Navigating settings, opening apps, and using the keyboard