Our 2 iPad Pro 12.9 first gen 2015 are super laggy on iPadOS 14. Texting, typing comments on websites all have really bad lag. One is on 14.3 and the other was on 14.4 and now on 14.7.1. It seems 14.x might be optimized for newer ipads and thus our old ones are getting a bit unbearable. Both have new batteries and otherwise run well. Anyone out there have the same issue? I'm about to try to roll mine back to 13.7 to see if that helps.