I have realised since the last iOS9 update that both mine and the wife’s iPad Mini (version 1) have both been crawling along horribly slowly and crashing out largely because of adverts on the devices when web browsing on the device.
It happens on Safari and Chrome and its made equally frustrating by the fact that Apple appear to be putting the device out to a legacy footing now, as its an older 32 bit device and apparently you can’t get adblocking software for the non-64 bit devices from my web searching relating to it, which may help the experience.
It seems a new iPad will have to be gotten for me and the wife at some point in the year when it becomes super unbearable, I am betting the next update to iOS9 here now.