Denuvo can have an impact if it's not correctly implemented, that's why it was removed from Humankind, they hadn't enough time to do it right, which was one of my concern when Denuvo was announced: could Firaxis do it right ? Would they remove it if they can't ?
I'll test myself very soon, but if the reviews are correct and there is lag in UI and stutter when moving the map even on high end PC, one may wonder which part is simply bad optimization of the game itself, or bad implementation of Denuvo, or both.
Bad performance could also be from the changes in the engine from previous version, for the UI for example civ6 Lua was faster than civ5 Lua, and for civ7 there is some questions on which scripting langage is used, a leaked screen implied javascript for multiplatform development, which mean they've totally redone the UI (and kind of explain why it's so bad on PC)
We've no idea how the version used compare with civ6 Lua
