Chosen Solution

Ever since installing iOS 11, my iPad Air has been terribly slow. Siri became nigh useless with excruciating delays. There was a lot of press over Apple slowing down old iPhones because of battery issues. Has the same been done to iPads? Will replacing the battery (iPad Air, iPad 5, iPad 6 Battery) fix this problem?

No, iPads are not affected by this issue as they do not use the same power management systems as they do on iPhones: https://www.imore.com/no-ipad-slow