Since big volume printers are quite common lately, better controls over the infill is desirable. Indeed, with my latest big prints I had some problems with "Sparse Infill" under big Top solid infill: those Sparse Infill begin too early and with too much density percentage, resulting in a really long time and too much plastic for the task; indeed the first Sparse Infill layer over the normal infill is already perfect and would be already great for the first Top Infill.
It would need so, a better logic to plans those Sparse Infill, and maybe a setting where to chose how many "Sparse Infill layers under Top" we want.
P.S.: for the object in the pic, the actual logic plans 10 layers of Sparse Infill, for 2,4 mm and taking something like 3h of printing time...
Ridiculous, isn't it?