We have a collection that contains several boards in sheet view.
It's impossible to scroll through that collection smoothly.
There are around 30 cards visible on the screen.
This is even when only a single collection is open.
Scrolling through a glorified spreadsheet has no excuse to be not smooth.
There is nothing on the screen that requires any amount of complex calculations or graphics rendering.
How can you ship this?
Do you honestly believe that this level of performance is acceptable?