My 2019 iPad Air with 3GB RAM runs it fine including multi window mode. That by itself makes it the most significant upgrade in at least the last 10 years
My iPhone 13 mini launched around the same time runs it with zero problems
We have a mini in my household and I wouldn’t call it “zero problems”. It’s usable but definitely slower than iOS 18. My iPhone 17 visibly struggles with basic browser UI rendering. I’m not satisfied with iOS 26. Here’s hoping they improve performance in 27.