I delayed upgrade to IPadOS 26.3 til reddit users shared on /r/ipad that its performance was on par with older version now. However, once I upgrade, the performance issues and bugs are noticeable instantly. For example,

1. switching between different browser tabs has a sub-second delay(est 200ms) 2. a tab in system settings menu takes 200ms to load 3. maximizing a video doesn't always work(sometimes it leaves a big white space on top) 4. double tabbing a keyboard key often triggers zooming into the browser page

I couldn't believe these issues haven't been fixed after 3 subversions.