So, I installed version 15.3.1 on my iPad 8th gen. yesterday. And I wish I hadn't. It's pretty bad. Everything is laggy.
I did reboot the iPad. Twice. No effect.
Pages load slow in Safari and Firefox. And I mean slow. It just halts halfway and it can take as long as 10 seconds before the whole page appears, depending on its content.
A page of thumbnails with images doesn't load instantly, like it always has before, but is now an empty space in which the thumbnails then start to pop up, one by one. I scroll on, repeat.
Apple Maps now shows me a grid. After a few second the grid starts to be filled in. I move the map slightly, zoom in, zoom out, the grid is back. I didn't even know there was a grid as I'd never seen it before.
Video. Watching a movie on AppleTV. It pauses at times. Just halts. Then continues.
This is bad. And Apple has unsigned all previous version so I can't undo this.
Damn.