To increase performance overall, I want to suggest two approaches
1) Move all UI elements to the bottom. Then reduce the actual rendered screen area. This could probably improve fps by 20% or more. Catch: UI elements might have to undergo a redesign to fit the available space more appropriately as otherwise there would be empty (black) space between them.
[img]
https://ibb.co/JvXjcBh[/img]
2) Because the current UI elements are fixed in position, it is maybe possible to reduce the resolution below those elements, aka dynamic resolution scaling in those areas that are hidden by UI elements anyway.